INATURALIST Observations 39873950
Guaymas, Sonora: 28.135708, -111.30075: : 10/18/2019: goawaysyd: 18 Oct 2019 ; Coordinate Uncertainty in Meters: 5.00000.

INATURALIST Observations 141015253
Guaymas, Sonora: 28.137772, -111.291138: : 10/21/2022: naturalistgaby: 21 Oct 2022 ; Coordinate Uncertainty in Meters: 88.00000.

INATURALIST Observations 14899717
Hermosillo, Sonora: 28.3039, -111.384729: : 7/27/2018: Usvaldo GC: 27 Jul 2018 ; Coordinate Uncertainty in Meters: 244.00000.

Hermosillo, Sonora: 28.305563, -111.364403: : 8/28/2019: Usvaldo GC: 28 Aug 2019 ; Coordinate Uncertainty in Meters: 0.11000.

Hermosillo, Sonora: 28.440183, -111.384783: : 5/25/2021: Aar├│n Olivarr├¡a: 25 May 2021 ; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: Rastros; Coordinate Uncertainty in Meters: 21.00000.

Hermosillo, Sonora: 28.803889, -111.81646: : 8/18/2017: John Sullivan: 18 Aug 2017 ; Coordinate Uncertainty in Meters: 29558.00000.

Hermosillo, Sonora: 28.807523, -112.375283: : 8/27/2020: Ricardo Rodriguez: 27 Aug 2020 ; Coordinate Uncertainty in Meters: 29558.00000.

Hermosillo, Sonora: 28.819686, -111.927489: : 1/13/2017: lauraelenawicochea: 13 Jan 2017 ; Coordinate Uncertainty in Meters: 464.00000.

Hermosillo, Sonora: 28.820368, -111.927477: : 1/13/2017: lauraelenawicochea: 13 Jan 2017 ; Coordinate Uncertainty in Meters: 116.00000.

Hermosillo, Sonora: 28.822005, -111.811158: : 8/10/2022: Oscar Leonardo Chavez Torres: 10 Aug 2022 ; Coordinate Uncertainty in Meters: 19.00000.

Hermosillo, Sonora: 28.829177, -111.73643: : 9/20/2021: Biol. Roberto Ansoleaga: 20 Sep 2021 ; Coordinate Uncertainty in Meters: 0.11000.

Hermosillo, Sonora: 28.829193, -111.736402: : 9/20/2021: Biol. Roberto Ansoleaga: 20 Sep 2021 ; Coordinate Uncertainty in Meters: 0.11000.

Hermosillo, Sonora: 28.832803, -111.491317: : 9/5/2021: Iv├ín Trinidad Ahumada Carrillo: 5 Sep 2021 ; Coordinate Uncertainty in Meters: 24349.00000.

Hermosillo, Sonora: 28.882151, -111.168628: : 6/5/2022: Andr├⌐s Verver: 5 Jun 2022 ; Coordinate Uncertainty in Meters: 192.00000.

Hermosillo, Sonora: 28.893938, -111.869833: : 8/19/2017: Gert Jan Verspui: 19 Aug 2017 ; Coordinate Uncertainty in Meters: 14881.00000.

Hermosillo, Sonora: 28.907666, -112.032967: : 4/4/2013: diegoleon22: 4 Apr 2013 ; Coordinate Uncertainty in Meters: 232.00000.

Hermosillo, Sonora: 28.91915, -111.217613: : 8/13/2021: Francisco Javier Campas G├│mez: 13 Aug 2021 ; Coordinate Uncertainty in Meters: 8.00000.

Unknown, Sonora: 28.92758, -112.044892: : 7/17/2026: Camila Montoya F├⌐lix: 17 Jul 2026 ; Coordinate Uncertainty in Meters: 4.00000.

Hermosillo, Sonora: 28.933555, -111.830747: : 8/18/2017: John Sullivan: 18 Aug 2017 ; Coordinate Uncertainty in Meters: 29558.00000.

Hermosillo, Sonora: 28.96411, -112.076102: : 8/27/2014: skystevens: 27 Aug 2014 ; Coordinate Uncertainty in Meters: 5.00000.

Occurrence Remarks: Baby; Coordinate Uncertainty in Meters: 10.00000.

Hermosillo, Sonora: 29.001411, -112.133876: : 7/1/2023: Jaime R Brise├▒o: 1 Jul 2023 ; Coordinate Uncertainty in Meters: 500.00000.

Hermosillo, Sonora: 29.042728, -111.074005: : 7/11/2021: Oscar Leonardo Chavez Torres: 11 Jul 2021 ; Coordinate Uncertainty in Meters: 4.00000.

Unknown, Sonora: 29.004891, -112.196126: : 10/19/2022: Rodrigo Osvaldo Borbon V├ízquez: 19 Oct 2022 ; Coordinate Uncertainty in Meters: 199.00000.

Hermosillo, Sonora: 29.184667, -111.723166: : 7/4/2024: Romana Estefan├¡a Z├írate Santiago: 4 Jul 2024 ; Coordinate Uncertainty in Meters: 3.00000.

Hermosillo, Sonora: 29.188402, -111.730371: : 11/20/2024: Romana Estefan├¡a Z├írate Santiago: 20 Nov 2024 ; Coordinate Uncertainty in Meters: 570.00000.

Hermosillo, Sonora: 29.198036, -111.741571: : 7/4/2024: Romana Estefan├¡a Z├írate Santiago: 4 Jul 2024 ; Coordinate Uncertainty in Meters: 4.00000.

Occurrence Remarks: carretera rumbo a la mina nico; Coordinate Uncertainty in Meters: 918.00000.

Hermosillo, Sonora: 28.971878, -112.155132: : 12/14/2021: Jesse Fagan: 14 Dec 2021 ; Coordinate Uncertainty in Meters: 122.00000.

Hermosillo, Sonora: 28.908902, -111.198666: : 6/5/2022: jorgeortizv: 5 Jun 2022 ; Coordinate Uncertainty in Meters: 61.00000.

Occurrence Remarks: Tracks in sand.; Coordinate Uncertainty in Meters: 160.00000.

Hermosillo, Sonora: 29.184574, -111.723168: : 10/10/2024: Romana Estefan├¡a Z├írate Santiago: 10 Oct 2024 ; Coordinate Uncertainty in Meters: 436.00000.

Pitiquito, Sonora: 29.878183, -112.533905: : 10/26/2022: Ricardo Rivera: 26 Oct 2022 ; Coordinate Uncertainty in Meters: 0.11000.

Pitiquito, Sonora: 29.890102, -112.656812: : 8/30/2022: Eber Chavez: 30 Aug 2022 ; Coordinate Uncertainty in Meters: 326.00000.

Pitiquito, Sonora: 29.903217, -112.676483: : 11/23/2017: Eric Centenero Alcal├í: 23 Nov 2017 ; Coordinate Uncertainty in Meters: 5000.00000.

Pitiquito, Sonora: 29.903361, -112.676406: : 11/15/2017: Eric Centenero Alcal├í: 15 Nov 2017 ; Coordinate Uncertainty in Meters: 5000.00000.

Pitiquito, Sonora: 29.904078, -112.676064: : 11/16/2017: Eric Centenero Alcal├í: 16 Nov 2017 ; Coordinate Uncertainty in Meters: 5000.00000.

Pitiquito, Sonora: 29.910704, -112.663153: : 8/24/2019: Jessica M. Rupit: 24 Aug 2019 ; Coordinate Uncertainty in Meters: 175.00000.

Pitiquito, Sonora: 29.918371, -112.569474: : 7/4/2024: Antonio Bautista Escobar: 4 Jul 2024 ; Coordinate Uncertainty in Meters: 13612.00000.

Pitiquito, Sonora: 29.956304, -112.657191: : 8/11/2017: MiltonRuiz: 11 Aug 2017 ; Coordinate Uncertainty in Meters: 1376.00000.

Pitiquito, Sonora: 29.968978, -112.640756: : 3/21/2018: Eric Centenero Alcal├í: 21 Mar 2018 ; Coordinate Uncertainty in Meters: 5000.00000.

Pitiquito, Sonora: 29.971262, -112.647235: : 2/18/2018: Eric Centenero Alcal├í: 18 Feb 2018 ; Coordinate Uncertainty in Meters: 5000.00000.

Pitiquito, Sonora: 29.984867, -112.631758: : 3/24/2018: Eric Centenero Alcal├í: 24 Mar 2018 ; Coordinate Uncertainty in Meters: 5000.00000.

Pitiquito, Sonora: 29.98653, -112.659269: : 12/6/2017: Eric Centenero Alcal├í: 6 Dec 2017 ; Coordinate Uncertainty in Meters: 61.00000.

Pitiquito, Sonora: 29.987019, -112.655992: : 12/6/2017: Eric Centenero Alcal├í: 6 Dec 2017 ; Coordinate Uncertainty in Meters: 5000.00000.

Pitiquito, Sonora: 29.987644, -112.652697: : 2/13/2018: Eric Centenero Alcal├í: 13 Feb 2018 ; Coordinate Uncertainty in Meters: 15.00000.

Pitiquito, Sonora: 29.988565, -112.65125: : 2/6/2018: Eric Centenero Alcal├í: 6 Feb 2018 ; Coordinate Uncertainty in Meters: 61.00000.

Caborca, Sonora: 30.320746, -112.794742: : 11/11/2008: Christine Hass: 11 Nov 2008 ; Coordinate Uncertainty in Meters: 150.00000.

Occurrence Remarks: DOR; Coordinate Uncertainty in Meters: 0.11000.

Pitiquito, Sonora: 30.611298, -112.084938: : 5/3/2019: Aar├│n Olivarr├¡a: 3 May 2019 ; Coordinate Uncertainty in Meters: 0.11000.

Ensenada, Baja California: 30.839307, -114.715043: : 5/6/2017: gisel_15: 6 May 2017 ; Coordinate Uncertainty in Meters: 10.00000.

Mexicali, Baja California: 30.937452, -114.734971: : 3/29/1995: Ana Gatica Colima: 29 Mar 1995 ; Coordinate Uncertainty in Meters: 0.11000.

Mexicali, Baja California: 30.953414, -114.772559: : 6/30/2024: Leonardo Ponce: 30 Jun 2024 ; Coordinate Uncertainty in Meters: 101.00000.

Pitiquito, Sonora: 29.855419, -112.536136: : 9/21/2022: jesusrosas: 21 Sep 2022 ; Coordinate Uncertainty in Meters: 0.11000.

Unknown, Baja California: 29.940645, -114.434501: : 10/2/2016: Benjamin German, MD: 2 Oct 2016 ; Coordinate Uncertainty in Meters: 29433.00000.

Occurrence Remarks:; Coordinate Uncertainty in Meters: 122.00000.

Mexicali, Baja California: 31.098921, -114.913917: : 5/31/2025: Brian Simison: 31 May 2025 ; Coordinate Uncertainty in Meters: 31.00000.

Mexicali, Baja California: 31.099263, -114.896644: : 5/31/2025: Brian Simison: 31 May 2025 ; Coordinate Uncertainty in Meters: 2.00000.

Caborca, Sonora: 30.780366, -112.736479: : 10/27/2021: Snakehackle: 27 Oct 2021 ; Coordinate Uncertainty in Meters: 2149.00000.

Occurrence Remarks:; Coordinate Uncertainty in Meters: 15.00000.

Occurrence Remarks:; Coordinate Uncertainty in Meters: 8.00000.

Occurrence Remarks: Occurrence Remarks: Was coiled out in the open. Eventually slithered into a burrow and formed an ambush posture.; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: Occurrence Remarks: 83F; Coordinate Uncertainty in Meters: 3.00000.

Puerto Penasco, Sonora: 31.679514, -113.304578: : 9/2/2022: gisel_15: 2 Sep 2022 ; Coordinate Uncertainty in Meters: 10.00000.

Mexicali, Baja California: 31.139652, -114.926918: : 5/9/2025: desertmouse67: 9 May 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Mexicali, Baja California: 31.146267, -114.939788: : 5/11/2025: Brian Simison: 11 May 2025 ; Coordinate Uncertainty in Meters: 8.00000.

Puerto Penasco, Sonora: 31.352627, -113.157649: : 9/11/2021: Jorge Ram├¡rez: 11 Sep 2021 ; Coordinate Uncertainty in Meters: 10922.00000.

San Luis Rio Colorado, Sonora: 31.95, -114.733333: : 7/20/2012: Omar Correa Rodr├¡guez: 20 Jul 2012 ; Coordinate Uncertainty in Meters: 29480.00000.

San Luis Rio Colorado, Sonora: 31.551242, -114.275608: : 5/15/2023: pfog12: 15 May 2023 ; Coordinate Uncertainty in Meters: 192.00000.

Puerto Penasco, Sonora: 31.342149, -113.293489: : 12/27/2022: Ulises Pinedo: 27 Dec 2022 ; Coordinate Uncertainty in Meters: 29252.00000.

Puerto Penasco, Sonora: 31.340553, -112.998281: : 1/10/2023: Diego Iv├ín Cornejo de la Mora: 10 Jan 2023 ; Coordinate Uncertainty in Meters: 67881.00000.

Puerto Penasco, Sonora: 31.25404, -113.295852: : 1/7/2011: biolcait: 7 Jan 2011 ; Coordinate Uncertainty in Meters: 8.00000.

Puerto Penasco, Sonora: 31.26991, -113.220134: : 7/18/2023: HUMBERTO GONZALEZ VELIZ: 18 Jul 2023 ; Coordinate Uncertainty in Meters: 10922.00000.

Puerto Penasco, Sonora: 31.326822, -113.531184: : 1/10/2023: diegoivancornejo: 10 Jan 2023 ; Coordinate Uncertainty in Meters: 10922.00000.

Puerto Penasco, Sonora: 31.551545, -113.450675: : 3/28/2022: Scott Shupe: 28 Mar 2022 ; Coordinate Uncertainty in Meters: 122.00000.

Puerto Penasco, Sonora: 31.43945, -113.523317: : 6/29/2015: Carolina Ni├▒o: 29 Jun 2015 ; Coordinate Uncertainty in Meters: 29226.00000.

Puerto Penasco, Sonora: 31.325393, -113.447194: : 5/16/2023: Clarissa Moreno: 16 May 2023 ; Coordinate Uncertainty in Meters: 10922.00000.

Puerto Penasco, Sonora: 31.564204, -113.495572: : 9/6/2022: Rosario Mares Gracia: 6 Sep 2022 ; Coordinate Uncertainty in Meters: 8.00000.

Puerto Penasco, Sonora: 31.564243, -113.495994: : 9/6/2022: Rosario Mares Gracia: 6 Sep 2022 ; Coordinate Uncertainty in Meters: 15.00000.

Puerto Penasco, Sonora: 31.53932, -113.45662: : 7/8/2024: Leonel Francisco G├│mez Ru├¡z: 8 Jul 2024 ; Coordinate Uncertainty in Meters: 23.00000.

Puerto Penasco, Sonora: 31.75949, -113.30302: : 8/31/2019: Miguel Grageda: 31 Aug 2019 ; Coordinate Uncertainty in Meters: 641.00000.

General Plutarco Elias Calles, Sonora: 31.734007, -112.900314: : 5/19/2004: Ricardo Gonz├ílez: 19 May 2004 :
Occurrence Remarks: Localizada en expedici├│n nocturna, hermoso ejemplar de cascabel de cuernos.; Coordinate Uncertainty in Meters: 4.00000.

San Luis Rio Colorado, Sonora: 31.500873, -114.122498: : 4/30/2021: Lin Piest: 30 Apr 2021 ; Coordinate Uncertainty in Meters: 0.11000.

Puerto Penasco, Sonora: 31.567499, -113.491112: : 9/8/2017: Lin Piest: 8 Sep 2017 ; Coordinate Uncertainty in Meters: 0.11000.

Mexicali, Baja California: 31.299912, -115.43049: : 12/7/2017: hugorlandohdz: 7 Dec 2017 ; Coordinate Uncertainty in Meters: 8.00000.

San Luis Rio Colorado, Sonora: 31.493572, -114.114283: : 5/13/2001: Lin Piest: 13 May 2001 ; Coordinate Uncertainty in Meters: 15.00000.

Mexicali, Baja California: 31.20138, -114.955488: : 5/2/2017: Jorge H. Valdez: 2 May 2017 ; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 4130123697;; Coordinate Uncertainty in Meters: 5.00000.

San Luis Rio Colorado, Sonora: 31.750299, -114.349327: : 3/16/2024: Ivan Eduardo Parra Salazar: 16 Mar 2024 :
Occurrence Remarks: Ejemplar j├│ven, posiblemente nacido el verano pasado. Se encontraron moscas hemat├│fagas en ella; Coordinate Uncertainty in Meters: 0.11000.

San Luis Rio Colorado, Sonora: 31.524483, -114.19012: : 3/16/2024: Ivan Eduardo Parra Salazar: 16 Mar 2024 ; Coordinate Uncertainty in Meters: 0.11000.

San Luis Rio Colorado, Sonora: 31.523751, -114.18013: : 5/12/2024: Ivan Eduardo Parra Salazar: 12 May 2024 :
Occurrence Remarks: Foto por Vlad Parra; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4129725106;; Coordinate Uncertainty in Meters: 29120.00000.

Unknown, Sonora: 31.301188, -113.245398: : 4/2/2026: Ramiro alberto Ayala Savalija: 2 Apr 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: Rastros; Coordinate Uncertainty in Meters: 29226.00000.

San Luis Rio Colorado, Sonora: 31.753334, -114.327341: : 3/16/2024: Irma Cordova: 16 Mar 2024 ; Coordinate Uncertainty in Meters: 4938.00000.

Unknown, Sonora: 31.571666, -113.491612: : 12/12/2025: Brian Long: 12 Dec 2025 ; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 4130123097;; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: Was winding over the ground when found.; Coordinate Uncertainty in Meters: 29120.00000.

Mexicali, Baja California: 31.132483, -114.958047: : 10/3/2025: Brian Simison: 3 Oct 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Puerto Penasco, Sonora: 31.57235, -113.496253: : 7/28/2025: F. Gual-Suarez: 28 Jul 2025 ; Coordinate Uncertainty in Meters: 15.00000.

Occurrence Remarks: Large individual. Seen moving along the road.; Coordinate Uncertainty in Meters: 29120.00000.

GBIFID: 1838064660; Occurrence Remarks: Individual not seen. No other seen in five days of trip.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1839236627; Occurrence Remarks: Crotalus cerastes; 04 April 2018, 2105 MST McCain Loop Road, Tucson Mtn Park;; Coordinate Uncertainty in Meters: 100.00000.

Mexicali, Baja California: 31.128289, -114.96287: : 9/29/2025: Brian Simison: 29 Sep 2025 ; Coordinate Uncertainty in Meters: 2.00000.

GBIFID: 3902998329; Occurrence Remarks: Breezy with thunderstorms all around but dry at this location. 27C;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3947285391; Occurrence Remarks: Adult and 6 neonates;; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: DOR; Coordinate Uncertainty in Meters: 29146.00000.

GBIFID: 4853024562; Occurrence Remarks: 71F;; Coordinate Uncertainty in Meters: 29146.00000.

GBIFID: 4924082858; Occurrence Remarks: 91F;; Coordinate Uncertainty in Meters: 29146.00000.

GBIFID: 4923897297; Occurrence Remarks: DOR;; Coordinate Uncertainty in Meters: 29146.00000.

GBIFID: 1305148287; Occurrence Remarks: Found night driving Indian Route 34.;; Coordinate Uncertainty in Meters: 1500.00000.

GBIFID: 2294578211; Occurrence Remarks: sidewinder about 1 m inside a large abandoned south-facing mammal (probably coyote) burrow. Shade ground temp = 33C.;; Coordinate Uncertainty in Meters: 100.00000.

GBIFID: 2826330498; Occurrence Remarks: 15-18long;; Coordinate Uncertainty in Meters: 29120.00000.

GBIFID: 3124923963; Occurrence Remarks: Dying on the road;; Coordinate Uncertainty in Meters: 9.00000.

Mexicali, Baja California: 31.138878, -114.928291: : 4/26/2023: desertmouse67: 26 Apr 2023 ; Coordinate Uncertainty in Meters: 0.11000.

Mexicali, Baja California: 31.818889, -115.361389: : 9/23/2014: Alyssa Semerdjian: 23 Sep 2014 ; Coordinate Uncertainty in Meters: 325.00000.

Mexicali, Baja California: 31.275556, -114.980556: : 9/24/2014: Alyssa Semerdjian: 24 Sep 2014 ; Coordinate Uncertainty in Meters: 103.00000.

Mexicali, Baja California: 31.279238, -115.344719: : 7/5/2018: Edgar Lima Garrido: 5 Jul 2018 ; Coordinate Uncertainty in Meters: 7643.00000.

GBIFID: 3355463594; Occurrence Remarks: DOR;; Coordinate Uncertainty in Meters: 977.00000.

GBIFID: 1305150060; Occurrence Remarks: Found in the middle of Hwy 86 on the way back to camp from night driving. End of tail looked freshly wounded, probably hit by a recent car.;; Coordinate Uncertainty in Meters: 1000.00000.

Mexicali, Baja California: 31.909866, -115.432569: : 2/26/2024: Helxine Fuentes Moreno: 26 Feb 2024 ; Coordinate Uncertainty in Meters: 29173.00000.

Puerto Penasco, Sonora: 31.326822, -113.531184: : 5/16/2023: Andr├⌐s Verver: 16 May 2023 ; Coordinate Uncertainty in Meters: 10922.00000.

Puerto Penasco, Sonora: 31.355279, -113.224818: : 9/8/2021: Jos├⌐ Castillo Romero: 8 Sep 2021 ; Coordinate Uncertainty in Meters: 7180.00000.

Mexicali, Baja California: 31.144577, -114.923431: : 4/23/2024: desertmouse67: 23 Apr 2024 ; Coordinate Uncertainty in Meters: 0.11000.

Puerto Penasco, Sonora: 31.533947, -113.445787: : 9/1/2025: camilamofe: 1 Sep 2025 ; Coordinate Uncertainty in Meters: 4.00000.

Mexicali, Baja California: 31.243743, -115.214177: : 4/27/2019: Tim Warfel: 27 Apr 2019 ; Coordinate Uncertainty in Meters: 29252.00000.

Puerto Penasco, Sonora: 31.371805, -113.573379: : 10/7/2021: islasdelmar: 7 Oct 2021 ; Coordinate Uncertainty in Meters: 61.00000.

Puerto Penasco, Sonora: 31.371823, -113.573389: : 10/7/2021: islasdelmar: 7 Oct 2021 ; Coordinate Uncertainty in Meters: 8.00000.

Puerto Penasco, Sonora: 31.436945, -113.432978: : 5/13/2024: Ivan Eduardo Parra Salazar: 13 May 2024 ; Coordinate Uncertainty in Meters: 0.11000.

Puerto Penasco, Sonora: 31.567438, -113.491172: : 9/12/2024: Leonel Francisco G├│mez Ru├¡z: 12 Sep 2024 ; Coordinate Uncertainty in Meters: 4.00000.

Occurrence Remarks: First photo is as found. Was stretched out on the edge of the road.; Coordinate Uncertainty in Meters: 29120.00000.

Puerto Penasco, Sonora: 31.326822, -113.531184: : 5/22/2023: Andr├⌐s Verver: 22 May 2023 ; Coordinate Uncertainty in Meters: 10922.00000.

Mexicali, Baja California: 31.143252, -114.923361: : 8/25/2025: Brian Simison: 25 Aug 2025 ; Coordinate Uncertainty in Meters: 4.00000.

San Luis Rio Colorado, Sonora: 31.523029, -114.215669: : 3/27/2022: Isaac Krone: 27 Mar 2022 ; Coordinate Uncertainty in Meters: 257.00000.

Puerto Penasco, Sonora: 31.322429, -113.270776: : 4/9/2022: Tereso Hern├índez Morales: 9 Apr 2022 ; Coordinate Uncertainty in Meters: 593.00000.

Mexicali, Baja California: 31.135035, -114.949306: : 8/25/2024: Brian Simison: 25 Aug 2024 ; Coordinate Uncertainty in Meters: 122.00000.

San Luis Rio Colorado, Arizona: 32.219092, -114.301782: : 7/6/2022: Grace Freymiller: 6 Jul 2022 ; Coordinate Uncertainty in Meters: 29120.00000.

Puerto Penasco, Sonora: 31.5675, -113.491111: : 9/8/2017: Lin Piest: 8 Sep 2017 ; Coordinate Uncertainty in Meters: 11.10000.

Occurrence Remarks: juvenile sidewinder approximately 20 cm long; Coordinate Uncertainty in Meters: 122.00000.

Mexicali, Baja California: 31.149416, -114.922989: : 10/14/2024: desertmouse67: 14 Oct 2024 ; Coordinate Uncertainty in Meters: 0.11000.

San Luis Rio Colorado, Sonora: 31.753782, -114.373786: : 4/3/2022: chubel77: 3 Apr 2022 ; Coordinate Uncertainty in Meters: 122.00000.

San Luis Rio Colorado, Arizona: 32.2152, -114.343012: : 7/7/2022: Grace Freymiller: 7 Jul 2022 ; Coordinate Uncertainty in Meters: 29120.00000.

Puerto Penasco, Sonora: 31.572647, -113.501526: : 8/29/2022: gisel_15: 29 Aug 2022 ; Coordinate Uncertainty in Meters: 0.11000.

Puerto Penasco, Sonora: 31.539394, -113.456849: : 5/12/2024: Ivan Eduardo Parra Salazar: 12 May 2024 :
Occurrence Remarks: Foto por Vlad Parra; Coordinate Uncertainty in Meters: 0.11000.

San Luis Rio Colorado, Sonora: 31.568501, -114.296336: : 10/14/2020: Adi Sula: 14 Oct 2020 ; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 3892578717; Occurrence Remarks: Permit required;; Coordinate Uncertainty in Meters: 4.00000.

Tecate, California: 32.603312, -115.94201: : 7/13/2019: Sam Fellows: 13 Jul 2019 ; Coordinate Uncertainty in Meters: 29066.00000.

San Luis Rio Colorado, Sonora: 32.396253, -114.560075: : 12/17/2022: olivermarban: 17 Dec 2022 ; Coordinate Uncertainty in Meters: 4.00000.

Occurrence Remarks: alive, but sadly seems to have been struck and injured near the rattle. moved away on its own after a while.; Coordinate Uncertainty in Meters: 19.00000.

Pinal, Arizona: 32.532304, -111.368567: : 9/11/2025: Sean Hartnett: 11 Sep 2025 ; Coordinate Uncertainty in Meters: 29093.00000.

Mexicali, California: 32.624314, -114.924298: : 4/8/2022: colanegra: 8 Apr 2022 ; Coordinate Uncertainty in Meters: 29066.00000.

Mexicali, Baja California: 32.511991, -115.479173: : 4/8/2022: Ricardo Rivera: 8 Apr 2022 ; Coordinate Uncertainty in Meters: 0.11000.

San Luis Rio Colorado, Arizona: 32.280245, -114.44432: : 3/13/2023: gila_cerveza: 13 Mar 2023 ; Coordinate Uncertainty in Meters: 29120.00000.

San Luis Rio Colorado, Sonora: 32.413737, -114.714969: : 6/17/2022: Victor Gonz├ílez: 17 Jun 2022 ; Coordinate Uncertainty in Meters: 2821.00000.

Occurrence Remarks: Long. aprox. 30cm Bajo arbusto de Larrea tridentata; Coordinate Uncertainty in Meters: 31.00000.

Tecate, California: 32.609524, -116.10191: : 4/12/2024: herphendrie: 12 Apr 2024 ; Coordinate Uncertainty in Meters: 29066.00000.

Mexicali, Baja California: 32.45484, -115.79245: : 7/3/2016: Jorge H. Valdez: 3 Jul 2016 ; Coordinate Uncertainty in Meters: 1.11000.

Mexicali, Baja California: 32.627007, -115.180342: : 10/3/2021: quartop: 3 Oct 2021 ; Coordinate Uncertainty in Meters: 146.00000.

GBIFID: 4937001265; Occurrence Remarks: AOR. Need to research locality. GTS 2054. Map point is approximate.;; Coordinate Uncertainty in Meters: 5687.00000.

Pima, Arizona: 32.380445, -111.371779: : 4/9/2026: Bill Chambers: 9 Apr 2026 ; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4129864089; Occurrence Remarks: Exhibited head-hiding behavior similar to Heterodon;; Coordinate Uncertainty in Meters: 29093.00000.

Occurrence Remarks: 1 of 2 seen tonight. Rained earlier in the week.; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: First AZ snake of the year. 1 of 2 seen tonight. First photo is as found.; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: AOR; Coordinate Uncertainty in Meters: 8.00000.

Occurrence Remarks: AOR; Coordinate Uncertainty in Meters: 15.00000.

Occurrence Remarks: Rained in this area the last two nights.; Coordinate Uncertainty in Meters: 29120.00000.

Pima, Arizona: 32.405151, -111.372211: : 9/5/2025: jugbayjs: 5 Sep 2025 ; Coordinate Uncertainty in Meters: 8.00000.

Pima, Arizona: 32.403333, -111.372159: : 9/5/2025: jugbayjs: 5 Sep 2025 ; Coordinate Uncertainty in Meters: 6.00000.

Pima, Arizona: 32.378187, -111.352287: : 5/9/2026: Irene Dickinson: 9 May 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Pima, Arizona: 32.253943, -111.291301: : 5/15/2026: Benjamin Wilder: 15 May 2026 ; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: 1 of 4 seen alive on the road this night. To the East, an early season monsoon rainstorm and low pressure zone was moving northward during the time of the observation.; Coordinate Uncertainty in Meters: 29120.00000.

Pima, Arizona: 32.313535, -111.25322: : 5/10/2026: cameron_tescher: 10 May 2026 ; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: Tiny neonate. About 8 in total length.; Coordinate Uncertainty in Meters: 3.00000.

Unknown, California: 32.60326, -116.011018: : 4/7/2026: Laine McTague: 7 Apr 2026 ; Coordinate Uncertainty in Meters: 29066.00000.

Pima, Arizona: 32.371171, -111.411723: : 4/9/2026: tmccarthey: 9 Apr 2026 ; Coordinate Uncertainty in Meters: 101.00000.

Pinal, Arizona: 32.616316, -111.255489: : 4/4/2026: Bill Chambers: 4 Apr 2026 ; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 3457197944; Occurrence Remarks: Adult Sonoran Sidewinder (Crotalus cerastes cercobombus), Pima County, Arizona It is widely known that differences in dorsal scale row count differentiate the Colorado and Sonoran Desert Sidewinder subspecies in dichotomous keys. Conversely, I get the sense the subspecies qualitative but marked differences in coloration are not widely appreciated.;; Coordinate Uncertainty in Meters: 5000.00000.

Pinal, Arizona: 32.612908, -111.236123: : 4/9/2026: Bill Chambers: 9 Apr 2026 ; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 1839272700; Occurrence Remarks: TA: 27.8 RH: 26.6 Wind:0 TG: 28.1 Overcast;; Coordinate Uncertainty in Meters: 29093.00000.

GBIFID: 3860277339; Occurrence Remarks: DOR;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3759268626; Occurrence Remarks: In the Tortolita Preserve, apparently killed by a vehicle as it crossed the Power line Road near SW corner of the Preserve. In a grassy creosote/Paloverde area about 2400 ft elevation. 75 F;; Coordinate Uncertainty in Meters: 393.00000.

GBIFID: 3903673023; Occurrence Remarks: Dead on road;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4096604779; Occurrence Remarks: Fresh DOR in past 45 minutes;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4103372493; Occurrence Remarks: Lying flat on a paved access road, then moved into a bush.;; Coordinate Uncertainty in Meters: 1387.00000.

GBIFID: 4130135486; Occurrence Remarks: Restricted access area;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4129950269; Occurrence Remarks: Restricted access area;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4129941173; Occurrence Remarks: Restricted access area;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4936556155; Occurrence Remarks: AOR. Need to research locality. GTS 2053. Map point is approximate.;; Coordinate Uncertainty in Meters: 5684.00000.

GBIFID: 4936934756; Occurrence Remarks: AOR. Need to research the locality better. GTS 2052. Map point is approximate.;; Coordinate Uncertainty in Meters: 500.00000.

GBIFID: 4414026178; Occurrence Remarks: Was originally coiled up in the dirt road. Was released off the road.;; Coordinate Uncertainty in Meters: 29120.00000.

GBIFID: 4420946837; Occurrence Remarks: DidnÆt move straight, moved sideways;; Coordinate Uncertainty in Meters: 67.00000.

Pima, Arizona: 32.381196, -111.371532: : 4/6/2026: Bill Chambers: 6 Apr 2026 ; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 4424288949; Occurrence Remarks: One of three sidewinders encountered on this night and removed from the road. Very calm snake.;; Coordinate Uncertainty in Meters: 29093.00000.

GBIFID: 4424570530; Occurrence Remarks: One of three sidewinders encountered on this night and removed from the road.;; Coordinate Uncertainty in Meters: 29093.00000.

GBIFID: 4424539469; Occurrence Remarks: One of three sidewinders encountered on this night and removed from the road.;; Coordinate Uncertainty in Meters: 29120.00000.

GBIFID: 4500697476; Occurrence Remarks: Late in season for nocturnal activity;; Coordinate Uncertainty in Meters: 29120.00000.

GBIFID: 4935636843; Occurrence Remarks: RemasterDirector_V0;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4606952009; Occurrence Remarks: In an area soon to be developed.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4851747845; Occurrence Remarks: Shined a signal mirror into the hole and saw him sitting there. He was right at the very entrance and pulled back when I initially walked up.;; Coordinate Uncertainty in Meters: 29066.00000.

GBIFID: 4901538380; Occurrence Remarks: Military land, no public access;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4923699891; Occurrence Remarks: 91F;; Coordinate Uncertainty in Meters: 29120.00000.

GBIFID: 4926095267; Occurrence Remarks: super cute and hid under my bag which made it even cuter;; Coordinate Uncertainty in Meters: 29120.00000.

GBIFID: 4867582108; Occurrence Remarks: in-situ;; Coordinate Uncertainty in Meters: 29093.00000.

Pima, Arizona: 32.378569, -111.372387: : 4/6/2026: Bill Chambers: 6 Apr 2026 ; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 5237641670; Occurrence Remarks: On a sandy trail at the edge of the mesa.;; Coordinate Uncertainty in Meters: 20.00000.

GBIFID: 2423094910; Occurrence Remarks: Dor adult Road center;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2451724022; Occurrence Remarks: Observed during a bio-monitoring gig on the Boeing/SBInet Project. Vicinity of Ajo, Arizona.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1668835296; Occurrence Remarks: Male;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 2980858110; Occurrence Remarks: Has a rattler;; Coordinate Uncertainty in Meters: 0.11000.

Pima, Arizona: 32.49162, -111.285643: : 8/21/2025: mywildbackyard: 21 Aug 2025 ; Coordinate Uncertainty in Meters: 29093.00000.

Occurrence Remarks: More trip details can be read here: Coordinate Uncertainty in Meters: 29066.00000.

Pima, Arizona: 32.256441, -111.283238: : 8/21/2025: mywildbackyard: 21 Aug 2025 ; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: Initially found by Tim Dayton. Has been in ambush at this spot for the past 2 weeks. My first cratered sidewinder.; Coordinate Uncertainty in Meters: 29120.00000.

Pinal, Arizona: 32.595872, -111.333328: : 9/11/2025: Wolfgang W├╝ster: 11 Sep 2025 ; Coordinate Uncertainty in Meters: 2.00000.

Pima, Arizona: 32.402837, -111.372208: : 9/13/2025: Neil Balchan: 13 Sep 2025 ; Coordinate Uncertainty in Meters: 4.00000.

Pima, Arizona: 32.376788, -111.357133: : 9/13/2025: Neil Balchan: 13 Sep 2025 ; Coordinate Uncertainty in Meters: 32.00000.

Pinal, Arizona: 32.612792, -111.238097: : 9/13/2025: Neil Balchan: 13 Sep 2025 ; Coordinate Uncertainty in Meters: 14.00000.

Mexicali, Baja California: 32.37564, -115.314831: : 6/4/2019: Alvaro Monter Pozos: 4 Jun 2019 :
Occurrence Remarks: BIODIVERSIDAD DE LA SIERRA CUCAP├ü Y SUS ALREDEDORES; Coordinate Uncertainty in Meters: 2116.00000.

Maricopa, Arizona: 32.570963, -112.824314: : 3/20/2026: Vikki Jackson: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 29093.00000.

Tecate, Baja California: 32.599313, -115.935245: : 3/27/2024: No├⌐ Santiago: 27 Mar 2024 ; Coordinate Uncertainty in Meters: 244.00000.

Occurrence Remarks: Really nice black spots on this one. The right eye was tilted to the anterior.; Coordinate Uncertainty in Meters: 29120.00000.

San Luis Rio Colorado, Arizona: 32.265076, -114.207351: : 6/9/2021: Grace Freymiller: 9 Jun 2021 ; Coordinate Uncertainty in Meters: 29120.00000.

Occurrence Remarks: Occurrence Remarks: Roadkill. Moved off the road; Coordinate Uncertainty in Meters: 2790.00000.

Imperial, California: 32.78262, -115.864062: : 3/30/2026: bayleystevens14: 30 Mar 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Occurrence Remarks: Occurrence Remarks: Found on road. Safely. Moved to shoulder; Coordinate Uncertainty in Meters: 1022.00000.

Imperial, California: 33.048225, -115.78318: : 4/1/2026: kyleemcf: 1 Apr 2026 ; Coordinate Uncertainty in Meters: 4.00000.

San Diego, California: 32.845097, -116.19928: : 10/25/2025: garthfauce: 25 Oct 2025 ; Coordinate Uncertainty in Meters: 4.00000.

Imperial, California: 32.775288, -116.071807: : 4/12/2024: herphendrie: 12 Apr 2024 ; Coordinate Uncertainty in Meters: 29066.00000.

Imperial, California: 32.702453, -116.050651: : 4/12/2024: herphendrie: 12 Apr 2024 ; Coordinate Uncertainty in Meters: 29066.00000.

Occurrence Remarks: -dead snake; Coordinate Uncertainty in Meters: 28248.00000.

Imperial, California: 32.948342, -115.15403: : 3/21/2026: Michael Zelun Lee: 21 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Imperial, California: 32.952358, -115.012093: : 10/19/2025: Bob Miller: 19 Oct 2025 ; Coordinate Uncertainty in Meters: 0.11000.

San Diego, California: 33.021314, -116.110944: : 9/21/2025: Justyn Stahl: 21 Sep 2025 ; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4102822394; Occurrence Remarks: Tracks;; Coordinate Uncertainty in Meters: 3.00000.

Imperial, California: 33.037752, -115.78514: : 4/8/2026: Dale Hameister: 8 Apr 2026 ; Coordinate Uncertainty in Meters: 2155.00000.

San Diego, California: 32.865513, -116.20983: : 3/14/2026: dusty1975: 14 Mar 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Occurrence Remarks: Surprised us in camp. We politely relocated them.; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: crater track; Coordinate Uncertainty in Meters: 29012.00000.

Occurrence Remarks: Found in yard under porch, with multiple rodent holes close by. With 11 buttons in rattle, possibly 30ΓÇ¥ in length.; Coordinate Uncertainty in Meters: 8.00000.

Occurrence Remarks: Resting on the road. Had eaten recently.; Coordinate Uncertainty in Meters: 29012.00000.

San Diego, California: 32.965156, -116.306097: : 9/20/2025: Bridget Spencer: 20 Sep 2025 ; Coordinate Uncertainty in Meters: 4.00000.

Occurrence Remarks: Distinctive sidewinder trail in sand dunes.; Coordinate Uncertainty in Meters: 4.00000.

Imperial, California: 32.891183, -115.988345: : 2/12/2026: Daniel Donovan: 12 Feb 2026 ; Coordinate Uncertainty in Meters: 5.00000.

Imperial, California: 32.747242, -116.017857: : 5/11/2025: Floyd E. Hayes: 11 May 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Imperial, California: 32.76849, -116.016572: : 5/11/2025: Floyd E. Hayes: 11 May 2025 ; Coordinate Uncertainty in Meters: 1.11000.

San Diego, California: 32.939172, -116.25899: : 3/10/2023: Chloe and Trevor Van Loon: 10 Mar 2023 :

Imperial, California: 32.766594, -115.998699: : 5/11/2025: Floyd E. Hayes: 11 May 2025 ; Coordinate Uncertainty in Meters: 2.00000.

Occurrence Remarks: Moving across the road and almost got hit by two vehicles. 2nd of 6 road cruised tonight. Also saw 3 DORs. Crazy (and concerning) to see so many out this early in the year, although it makes sense given the record-breaking heat wave.; Coordinate Uncertainty in Meters: 28984.00000.

Occurrence Remarks: Resting on the road. 3rd of 6 road cruised tonight. Also saw 3 DORs. Crazy (and concerning) to see so many out this early in the year, although it makes sense given the record-breaking heat wave.; Coordinate Uncertainty in Meters: 29012.00000.

Occurrence Remarks: Resting on the road. 4th of 6 road cruised tonight. Also saw 3 DORs. Crazy (and concerning) to see so many out this early in the year, although it makes sense given the record-breaking heat wave.; Coordinate Uncertainty in Meters: 29012.00000.

San Diego, California: 32.852105, -116.223738: : 3/7/2026: Patricia Vasquez: 7 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Imperial, California: 32.760525, -114.756155: : 2/24/2026: thekrysten: 24 Feb 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Occurrence Remarks: Hiding beneath creosote (Larrea tridentata) amongst creosote scrub.; Coordinate Uncertainty in Meters: 8081.00000.

Imperial, California: 32.65005, -115.955397: : 5/1/2026: Rachel S.: 1 May 2026 ; Coordinate Uncertainty in Meters: 1.11000.

Imperial, California: 32.647972, -115.954003: : 5/1/2026: Rebekah Shane: 1 May 2026 ; Coordinate Uncertainty in Meters: 23.00000.

San Diego, California: 33.222768, -116.389078: : 2/25/2026: srood: 25 Feb 2026 ; Coordinate Uncertainty in Meters: 3.00000.

San Diego, California: 32.852075, -116.223739: : 3/7/2026: Sergey: 7 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Imperial, California: 32.766173, -116.073196: : 5/8/2026: Davis Provan: 8 May 2026 ; Coordinate Uncertainty in Meters: 0.11000.

San Diego, California: 32.894507, -116.239847: : 4/7/2026: Laine McTague: 7 Apr 2026 ; Coordinate Uncertainty in Meters: 29039.00000.

Maricopa, Arizona: 33.189725, -112.34185: : 3/13/2026: Lauren Harter: 13 Mar 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Imperial, California: 32.98713, -115.136519: : 3/31/2026: Tony Iwane: 31 Mar 2026 ; Coordinate Uncertainty in Meters: 375.00000.

San Diego, California: 33.223306, -116.347645: : 5/2/2026: Davis Provan: 2 May 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Imperial, California: 32.705525, -116.00122: : 9/21/2025: Jeremiah Degenhardt: 21 Sep 2025 ; Coordinate Uncertainty in Meters: 29066.00000.

San Diego, California: 32.938247, -116.268897: : 5/8/2026: Davis Provan: 8 May 2026 ; Coordinate Uncertainty in Meters: 0.11000.

San Diego, California: 33.025446, -116.344615: : 4/7/2026: Laine McTague: 7 Apr 2026 ; Coordinate Uncertainty in Meters: 29012.00000.

Imperial, California: 32.986122, -115.139144: : 3/31/2026: Tony Iwane: 31 Mar 2026 ; Coordinate Uncertainty in Meters: 64.00000.

Imperial, California: 32.815684, -115.986154: : 9/26/2025: crotalus-tantalus: 26 Sep 2025 ; Coordinate Uncertainty in Meters: 29039.00000.

Imperial, California: 33.12507, -116.040163: : 3/23/2026: whereintarnation: 23 Mar 2026 ; Coordinate Uncertainty in Meters: 43.00000.

Occurrence Remarks: Basking in roads after dark, 100f during day was about 85f when found.; Coordinate Uncertainty in Meters: 4.00000.

San Diego, California: 33.219402, -116.370378: : 3/18/2026: Tom Mills: 18 Mar 2026 ; Coordinate Uncertainty in Meters: 28984.00000.

San Diego, California: 33.205722, -116.327837: : 3/27/2026: kperalta: 27 Mar 2026 ; Coordinate Uncertainty in Meters: 7.00000.

Imperial, California: 32.833073, -115.104337: : 3/23/2026: hammondhou: 23 Mar 2026 ; Coordinate Uncertainty in Meters: 29039.00000.

Imperial, California: 32.919023, -115.663417: : 4/3/2026: Melanie B.: 3 Apr 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: Almost accidentally stepped on this baby rattler on the trail, which had caught a lizard for breakfast. Glad I didnΓÇÖt!; Coordinate Uncertainty in Meters: 4.00000.

Imperial, California: 32.950548, -115.689276: : 4/8/2026: Melanie B.: 8 Apr 2026 ; Coordinate Uncertainty in Meters: 0.11000.

San Diego, California: 32.917162, -116.24405: : 3/18/2026: Mspiegelberg: 18 Mar 2026 ; Coordinate Uncertainty in Meters: 4.00000.

San Diego, California: 33.100308, -116.301327: : 3/28/2026: Tara Mae: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 28343.00000.

San Diego, California: 33.195228, -116.330338: : 6/13/2026: Tucker Heptinstall: 13 Jun 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Occurrence Remarks: Ocotillo Wells, CA; Coordinate Uncertainty in Meters: 29012.00000.

San Diego, California: 33.203933, -116.329942: : 3/28/2026: Max: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 9.00000.

Occurrence Remarks: DOR, Ocotillo Wells, CA; Coordinate Uncertainty in Meters: 29012.00000.

San Diego, California: 33.194003, -116.330537: : 6/13/2026: Tucker Heptinstall: 13 Jun 2026 ; Coordinate Uncertainty in Meters: 6.00000.

Occurrence Remarks: Moved off road; Coordinate Uncertainty in Meters: 101.00000.

San Diego, California: 33.194212, -116.330558: : 6/13/2026: Tucker Heptinstall: 13 Jun 2026 ; Coordinate Uncertainty in Meters: 27.00000.

Imperial, California: 33.018342, -115.10948: : 9/21/2025: Michael Zelun Lee: 21 Sep 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Imperial, California: 32.930878, -115.930253: : 6/23/2026: Nicolas Vinas: 23 Jun 2026 ; Coordinate Uncertainty in Meters: 3.00000.

San Diego, California: 33.217516, -116.249267: : 6/18/2026: sara schneider: 18 Jun 2026 ; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 3455943090; Occurrence Remarks: Less than 12 inches. Very small. Coiled in very rocky terrain. My foot was going down on that spot when my eye caught it and was able to miss stepping on it. It never moved for about a minute and then went quickly to cover in a small Larrea tridentata.;; Coordinate Uncertainty in Meters: 0.11000.

Imperial, California: 32.94828, -115.155717: : 3/21/2026: Michael Zelun Lee: 21 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 3456582874; Occurrence Remarks: Colorado Desert Sidewinder (Crotalus cerastes laterorepens), southwestern Imperial County, California;; Coordinate Uncertainty in Meters: 2500.00000.

GBIFID: 3455467222; Occurrence Remarks: Colorado Desert Sidewinder (Cortalus cerastes laterorepens), southeastern San Diego County, California;; Coordinate Uncertainty in Meters: 2000.00000.

GBIFID: 3455622147; Occurrence Remarks: Colorado Desert Sidewinder (Crotalus cerastes laterorepens), southeastern San Diego County, California;; Coordinate Uncertainty in Meters: 2000.00000.

GBIFID: 3456526383; Occurrence Remarks: Juvenile Colorado Desert Sidewinder (Crotalus cerastes laterorepens), southwestern Imperial County, California;; Coordinate Uncertainty in Meters: 300.00000.

GBIFID: 3457119310; Occurrence Remarks: A scrawny adult Colorado Desert Sidewinder (Crotalus cerastes laterorepens), southeastern Imperial County, California;; Coordinate Uncertainty in Meters: 10000.00000.

GBIFID: 3456741487; Occurrence Remarks: Juvenile Colorado Desert Sidewinder (Crotalus cerastes laterorepens), eastern Imperial County, California;; Coordinate Uncertainty in Meters: 10000.00000.

GBIFID: 3759415525; Occurrence Remarks: Near the intergrade zone with C. c. cercobombus.;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 3455856046; Occurrence Remarks: Neonate Colorado Desert Sidewinder (Crotalus cerastes laterorepens), southwestern Imperial County, California;; Coordinate Uncertainty in Meters: 2500.00000.

GBIFID: 3773151269; Occurrence Remarks: tracks;; Coordinate Uncertainty in Meters: 2442.00000.

GBIFID: 3773135131; Occurrence Remarks: juvenile tracks;; Coordinate Uncertainty in Meters: 2441.00000.

GBIFID: 1837779564; Occurrence Remarks: Note the belly tracks in the first photo. San Diego Tracking Team transact of Barrel Springs;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3773024403; Occurrence Remarks: Deceased baby;; Coordinate Uncertainty in Meters: 7.00000.

GBIFID: 3858341445; Occurrence Remarks: Roadkill.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3860706368; Occurrence Remarks: 2nd of three back-to-back DOR individuals;; Coordinate Uncertainty in Meters: 11.00000.

GBIFID: 3860631275; Occurrence Remarks: Seen shortly after passing [three DOR in short succession. Snake moved off of road after photos were taken. GIF of movement included.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 1847469137; Occurrence Remarks: Active moving on road;; Coordinate Uncertainty in Meters: 29066.00000.

GBIFID: 3860734254; Occurrence Remarks: 1st of three back-to-back DOR individuals;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3892467779; Occurrence Remarks: Permit required;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 3892647803; Occurrence Remarks: Permit required;; Coordinate Uncertainty in Meters: 12.00000.

GBIFID: 3860744239; Occurrence Remarks: 3rd of three back-to-back DOR individuals;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3912279837; Occurrence Remarks: I almost stepped on this young sidewinder - it was about 5 inches in length, from head to outer coil. It was coiled on the golf course grass, but only a few feet from bare earth adjacent to the course.;; Coordinate Uncertainty in Meters: 15.00000.

GBIFID: 3947128565; Occurrence Remarks: Lifer sonoran;; Coordinate Uncertainty in Meters: 29066.00000.

GBIFID: 1088962295; Occurrence Remarks: Found a pair mating in the am;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 3925044715; Occurrence Remarks: Tracks;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 4063111010; Occurrence Remarks: Guessing Colorado Desert Sidewinder ? Location is approx. Only got the one pic before it scooted off into opening to right, little rattling as it went. Surprised to see rattler in Jan - little breeze up so it was tucked into this nook on side of boulder. I was zoomed - guessing snake maybe 2.5 feet long. Could just see the little horns.;; Coordinate Uncertainty in Meters: 122.00000.

GBIFID: 4067308965; Occurrence Remarks: Tracks;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4076464832; Occurrence Remarks: 62F and lucky;; Coordinate Uncertainty in Meters: 29012.00000.

GBIFID: 4096604550; Occurrence Remarks: About 50 feet away from other one, moved away as I was taking photo;; Coordinate Uncertainty in Meters: 411.00000.

GBIFID: 4096953583; Occurrence Remarks: DOR ;(;; Coordinate Uncertainty in Meters: 307.00000.

GBIFID: 4096987596; Occurrence Remarks: 82 F Yawning in the first image;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 4096659601; Occurrence Remarks: Curled up on the sand shoulder of the road, completely still. Not seen until the leaf-nosed snake I was photographing feet away slithered up to it.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4096903740; Occurrence Remarks: Moved off road twice;; Coordinate Uncertainty in Meters: 474.00000.

GBIFID: 4103153915; Occurrence Remarks: Sign;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4103100917; Occurrence Remarks: Sign bed.;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4103158915; Occurrence Remarks: Sign. Bed.;; Coordinate Uncertainty in Meters: 7.00000.

GBIFID: 4133973052; Occurrence Remarks: Juvenile recently consumed meal;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4153833156; Occurrence Remarks: sidewinding off the road as I was driving to my camp spot;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 1933598155; Occurrence Remarks: In our backyard this morning, probably was lying all night in wait for the mice under our bird feeder.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1935591487; Occurrence Remarks: Two Sidewinders are mating. The smaller male is on top. Their tails are entwined. They stay together for about three hours. He licks the ridge of her back and rubs his chin on it.;; Coordinate Uncertainty in Meters: 30.00000.

GBIFID: 4424492439; Occurrence Remarks: mating under a palo verde tree;; Coordinate Uncertainty in Meters: 30.00000.

GBIFID: 4431106264; Occurrence Remarks: Tracks.;; Coordinate Uncertainty in Meters: 140.00000.

GBIFID: 4430793511; Occurrence Remarks: Snake was just scooting across S2 in the 5 AM dark. Apologies for low quality - only had flip-phone on me. It was pretty calm - just motored around awhile after I carefully herded it away from road - finally curled up under bush. Not sure if the little horns will show up very well. Looks big in pic but really only maybe about 2.5 feet.;; Coordinate Uncertainty in Meters: 31.00000.

GBIFID: 4436309563; Occurrence Remarks: Found at dusk - coming out of burrow. Approximately 1.5ft long.;; Coordinate Uncertainty in Meters: 62.00000.

GBIFID: 4177308761; Occurrence Remarks: Actual location within ~500 meters from whatÆs shown here;; Coordinate Uncertainty in Meters: 948.00000.

GBIFID: 4535896620; Occurrence Remarks: Young individual in ambush at kangaroo rat burrow entrance;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 4606951177; Occurrence Remarks: This area is closed to the public; I was there on duty as a resident volunteer.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4847253544; Occurrence Remarks: In sand beneath Larrea shrub.;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 4847261555; Occurrence Remarks: Juvenile at base of shrub during late morning, desert shrubland.;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 4597343819; Occurrence Remarks: This area is closed to the public; I was there on duty as a resident volunteer.;; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 4853058082; Occurrence Remarks: last pic has a track that crosses the Sidewinder track that may be a shovel-nose.;; Coordinate Uncertainty in Meters: 29066.00000.

GBIFID: 4855110817; Occurrence Remarks: Desert shrubland after sunset.;; Coordinate Uncertainty in Meters: 103.00000.

GBIFID: 4847246538; Occurrence Remarks: Beneath Larrea in sand.;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 4852338024; Occurrence Remarks: Collected and released during a flood of Painted Rock Reservoir.;; Coordinate Uncertainty in Meters: 6167.00000.

GBIFID: 4852597616; Occurrence Remarks: 63 F;; Coordinate Uncertainty in Meters: 3.00000.

San Diego, California: 33.181378, -116.332467: : 6/7/2024: california_every_reptile: 7 Jun 2024 :

GBIFID: 2238820929; Occurrence Remarks: I think a snake cooled up here for the night in the warm sand.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4923914865; Occurrence Remarks: Raindrops reflecting my flash.;; Coordinate Uncertainty in Meters: 1.00000.

GBIFID: 4923864355; Occurrence Remarks: Second one of night ... and last.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4936060832; Occurrence Remarks: AOR. Uncited coauthor in potentially forthcoming short medical case report. Roadcruising and sleep deprivation is a dangerous combination!;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4946567942; Occurrence Remarks: AOR;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4946177268; Occurrence Remarks: AOR; cruised with @birdnerd10; duplicate of one of his observations;; Coordinate Uncertainty in Meters: 53.00000.

GBIFID: 4946590110; Occurrence Remarks: AOR; cruised with @birdnerd10; duplicate of one of his observations. Actively moving during a fairly intense dust storm.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4946590082; Occurrence Remarks: AOR;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4946332507; Occurrence Remarks: AOR;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4952590398; Occurrence Remarks: Cratered after sunrise, traveled ~7-10m to elevated burrow in mesquite dune, past other available burrows;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 4952880016; Occurrence Remarks: On my property, in front garden;; Coordinate Uncertainty in Meters: 3906.00000.

GBIFID: 4994412691; Occurrence Remarks: Distinctive track in very fine sandy substrate;; Coordinate Uncertainty in Meters: 9.00000.

GBIFID: 5007514849; Occurrence Remarks: Baby Sidewinder, 6 inches long, right in the middle of the trail in The Slot.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 5076927715; Occurrence Remarks: We stood still. It came to us.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 5133230083; Occurrence Remarks: Beneath creosote in late morning.;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 5133425117; Occurrence Remarks: Found clearly suffering and on its back, wasnΓÇÖt gonna make it. I put them out of their misery, which felt bad but I think it was the right thing to do. Rest in peace;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 2269313775; Occurrence Remarks: dead on road;; Coordinate Uncertainty in Meters: 29012.00000.

GBIFID: 5140039149; Occurrence Remarks: A juvenile. Likely a 2024 baby;; Coordinate Uncertainty in Meters: 195.00000.

GBIFID: 2269307764; Occurrence Remarks: East Mesa; 7F;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2273316880; Occurrence Remarks: East Mesa; 2E;; Coordinate Uncertainty in Meters: 4.00000.

Imperial, California: 32.9351, -115.281089: : 6/26/2019: Bradford Hollingsworth: 26 Jun 2019 :
GBIFID: 2273317497; Occurrence Remarks: East Mesa; 1F;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2283048926; Occurrence Remarks: East Mesa; 9F;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 1262388018; Occurrence Remarks: Imperial County, California, US;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3399166312; Occurrence Remarks: Road kill.;; Coordinate Uncertainty in Meters: 14650.00000.

GBIFID: 1262387142; Occurrence Remarks: San Diego County, California, US;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 5177325045; Occurrence Remarks: 85 F;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 5238185713; Occurrence Remarks: Found on road as roadkill. Moved the side of the road;; Coordinate Uncertainty in Meters: 339.00000.

GBIFID: 5237580733; Occurrence Remarks: One of three seen on drive. Moved off the road to the shoulder for safety;; Coordinate Uncertainty in Meters: 1328.00000.

GBIFID: 2350371346; Occurrence Remarks: Dead on arrival;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2350376840; Occurrence Remarks: Dead on arrival;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 891714121; Occurrence Remarks: Imperial County, CA, US;; Coordinate Uncertainty in Meters: 1400.00000.

GBIFID: 2366062050; Occurrence Remarks: 3/22/2017 Ocotillo Wells;; Coordinate Uncertainty in Meters: 129.00000.

Imperial, California: 32.919053, -115.663413: : 4/3/2026: nmoorhatch: 3 Apr 2026 ; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2429303143; Occurrence Remarks: Dead on arrival;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2611326324; Occurrence Remarks: tragic one, stopped to look, and as i stopped, another car cruised by and hit it. real bummer, part of two that were within 10 feet of one another;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2611413294; Occurrence Remarks: there were two, within 10 feet of one another. Unfortunately the second one was hit by a driver AS we stopped.;; Coordinate Uncertainty in Meters: 171.00000.

GBIFID: 2620064045; Occurrence Remarks: I nearly stepped on this sidewinder as it made its way into our campsite;; Coordinate Uncertainty in Meters: 29012.00000.

GBIFID: 2619994011; Occurrence Remarks: the first photo is in situ, snake was resting at the side of a wash. Im not sure about the the subspecies of the ones here but Im pretty sure its cercobombus ??;; Coordinate Uncertainty in Meters: 122.00000.

GBIFID: 2620162775; Occurrence Remarks: Part of a very nice two nights with 20 snakes of 8 species including DORs - desert night, shovelnose, leafnose, longnose, glossy, lyre, coachwhip, sidewinder;; Coordinate Uncertainty in Meters: 28984.00000.

Imperial, California: 32.770695, -116.079269: : 3/26/2026: Kylie Etter: 26 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 2619905837; Occurrence Remarks: Me the big dummy let a leafnose get away right before this;; Coordinate Uncertainty in Meters: 29066.00000.

GBIFID: 2626626640; Occurrence Remarks: These were part of the most striking road stop Ive ever been a part of. At the NAFHA national meeting, us and two other cars came down this road. Two of us stopped about 50 yards apart, both in front of a live sidewinder. Then someone noticed a 3rd sidewinder halfway between us. While one of the kids was photographing a sidewinder, a shovelnose snake crawled right up next to him! Seeing how herpy the place was, I stepped off the road with my headlamp and was rewarded with a leafnose snake almost immediately. Five snakes on one stop at the side of the road!;; Coordinate Uncertainty in Meters: 29066.00000.

GBIFID: 2802783645; Occurrence Remarks: Warming up on asphalt;; Coordinate Uncertainty in Meters: 33.00000.

GBIFID: 2634382798; Occurrence Remarks: found within 100 feet of another adult sidewinder;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 2634082801; Occurrence Remarks: found within 100 feet of another adult;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 2634428787; Occurrence Remarks: super tiny one;; Coordinate Uncertainty in Meters: 29039.00000.

GBIFID: 2641533716; Occurrence Remarks: Might be the same individual but not completely sure;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 891039327; Occurrence Remarks: On way back from Phoenix for family trip I timed it so we would be going through some potentially good spots for night cruising but did not see anything in AZ and only snake was this sidewinder in the dunes, also found one desert banded gecko.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2823142284; Occurrence Remarks: This snake is better known as the Horned Rattlesnake. It inhabits desert regions of southwestern United States and parts of Mexico. It is a calm and calculated predator, whose speed can reach upwards of 18 MPH. Given the smaller stature of this snake, this is indicative of a male species, as females are larger. An uncommon attribute among snakes, however, this genus beats to its own drum.;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 899948396; Occurrence Remarks: First sidewinder of the season, this one surprised me when I flipped a medium size rock at the park. Its amazing how much they blend in with their surroundings.;; Coordinate Uncertainty in Meters: 11.10000.

GBIFID: 2862547932; Occurrence Remarks: Tracks visible behind it;; Coordinate Uncertainty in Meters: 29012.00000.

GBIFID: 2883141664; Occurrence Remarks: Individual not seen;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2882992610; Occurrence Remarks: No individual seen. Coil bed and tracks.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1500352511; Occurrence Remarks: Sidewinder found at OWSVRA near ranger station;; Coordinate Uncertainty in Meters: 29012.00000.

GBIFID: 2883176698; Occurrence Remarks: Multiple individuals. Possible mating pair tracks. Individuals not seen. This area had the most track and coil bed marks (4) of any location Ive been but could not find one!;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1562926505; Occurrence Remarks: Roadkill;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 2963811887; Occurrence Remarks: Hit by car. Still alive when found, but only able to move lower half of the body.;; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 899969199; Occurrence Remarks: Took the kids skating in Julian then headed down into the desert for road cruising. Only saw a few DOR geckos on road until we got into Borrego Springs then we found this DOR sidewinder. Temp was around mid 70s.;; Coordinate Uncertainty in Meters: 11.10000.

GBIFID: 899969209; Occurrence Remarks: Finally found a live snake, a fiesty little sidewinder that was hard to get off the road.;; Coordinate Uncertainty in Meters: 501.00000.

GBIFID: 899973175; Occurrence Remarks: Imperial County, California, US;; Coordinate Uncertainty in Meters: 179.00000.

GBIFID: 899973117; Occurrence Remarks: Imperial County, California, US Video of this snake is can be found on YouTube https://www.youtube.com/watch?v=CbTRebUqAtI;; Coordinate Uncertainty in Meters: 3308.00000.

GBIFID: 4945685213; Occurrence Remarks: SDSU herpetology field trip;; Coordinate Uncertainty in Meters: 29066.00000.

GBIFID: 3008479878; Occurrence Remarks: Sidewinder;; Coordinate Uncertainty in Meters: 5090.00000.

GBIFID: 3008491920; Occurrence Remarks: Sidewinder;; Coordinate Uncertainty in Meters: 3736.00000.

GBIFID: 911503954; Occurrence Remarks: Road cruising with Travis and Kellan, only snake seen all night;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1584437359; Occurrence Remarks: DOR moments later;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 923926787; Occurrence Remarks: Found this sidewinder on a dirt road while driving out to a remote canyon to do some night walking. First time finding on a dirt road, usually find on paved roads or flipped under rocks.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3090808375; Occurrence Remarks: Biggest IΓÇÖve ever seen;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 1024184041; Occurrence Remarks: Found night driving outside of Ocotillo, CA.;; Coordinate Uncertainty in Meters: 470.00000.

GBIFID: 3118352312; Occurrence Remarks: Audio recorded on cellphone. Trimmed and amplified using Audacity. It is one buzz repeated a second time.;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 1640088191; Occurrence Remarks: 8 photos total;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 1024224931; Occurrence Remarks: Imperial County, California, US Obvious Sidewinder tracks with the distinctive hook. Species seen and photographed (http://www.inaturalist.org/observations/871029) but is also the only species of Sidewinder in the area.;; Coordinate Uncertainty in Meters: 1426.00000.

GBIFID: 1024224926; Occurrence Remarks: Imperial County, California, US;; Coordinate Uncertainty in Meters: 1426.00000.

GBIFID: 1703233644; Occurrence Remarks: Strange looking animal. Very skinny but long, reduced pattern and horns. Almost struck me as a sidewinder / speck hybrid at first.;; Coordinate Uncertainty in Meters: 6191.00000.

GBIFID: 1703233676; Occurrence Remarks: Very pretty juvenile ~ 14 inches. Temperatures barely over 70 degrees.;; Coordinate Uncertainty in Meters: 6217.00000.

San Diego, California: 32.704297, -116.144074: : 9/21/2025: Oonagh: 21 Sep 2025 ; Coordinate Uncertainty in Meters: 29066.00000.

Mexicali, Baja California: 32.6948, -114.786537: : 1/12/2023: Francisco Javier Campas G├│mez: 12 Jan 2023 ; Coordinate Uncertainty in Meters: 4.00000.

Mexicali, Baja California: 32.67331, -115.190098: : 9/14/2023: Guillermo SG: 14 Sep 2023 ; Coordinate Uncertainty in Meters: 2351.00000.

Mexicali, Baja California: 32.701512, -114.781547: : 4/22/2025: Francisco Javier Campas G├│mez: 22 Apr 2025 :
Occurrence Remarks: Especie aproximadamente de 50cm de largo, se encontraba muy activa.; Coordinate Uncertainty in Meters: 50.00000.

GBIFID: 891093202; Occurrence Remarks: Always wanted to see one of these guys in the wild. He could move much faster than I would have thought!;; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 35.051797, -117.074241: : 4/3/2026: Lee: 3 Apr 2026 ; Coordinate Uncertainty in Meters: 105937.00000.

San Diego, California: 33.25033, -116.405913: : 10/20/2025: Leila Warren: 20 Oct 2025 ; Coordinate Uncertainty in Meters: 15.00000.

San Diego, California: 33.327589, -116.32172: : 10/21/2025: Nathan: 21 Oct 2025 ; Coordinate Uncertainty in Meters: 28984.00000.

Riverside, California: 33.64582, -114.65808: : 10/21/2025: bayleystevens14: 21 Oct 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Riverside, California: 33.850069, -116.639649: : 10/24/2025: Naomi Barber-Choi: 24 Oct 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

San Bernardino, California: 34.233088, -116.216688: : 10/23/2025: Marion Anthonisen: 23 Oct 2025 ; Coordinate Uncertainty in Meters: 4.00000.

Occurrence Remarks: Dead on the road at night; Coordinate Uncertainty in Meters: 6.00000.

San Bernardino, California: 35.020902, -116.989716: : 9/18/2025: mookazilla: 18 Sep 2025 ; Coordinate Uncertainty in Meters: 28734.00000.

Kern, California: 35.207461, -118.197263: : 9/28/2024: herphendrie: 28 Sep 2024 ; Coordinate Uncertainty in Meters: 28706.00000.

Riverside, California: 33.66433, -115.802217: : 10/21/2025: nmoorhatch: 21 Oct 2025 ; Coordinate Uncertainty in Meters: 2.00000.

Riverside, California: 33.91384, -116.634946: : 9/13/2025: herphendrie: 13 Sep 2025 ; Coordinate Uncertainty in Meters: 3747.00000.

Riverside, California: 33.914663, -116.661991: : 9/13/2025: herphendrie: 13 Sep 2025 ; Coordinate Uncertainty in Meters: 5043.00000.

Riverside, California: 33.917581, -116.651494: : 9/13/2025: herphendrie: 13 Sep 2025 ; Coordinate Uncertainty in Meters: 4305.00000.

Riverside, California: 33.673619, -115.975158: : 9/6/2025: Yinan Li: 6 Sep 2025 ; Coordinate Uncertainty in Meters: 28930.00000.

San Bernardino, California: 34.936043, -116.614249: : 10/24/2025: Arioch Mgreene: 24 Oct 2025 ; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 34.89849, -115.66538: : 11/5/2025: originaltrailcrew: 5 Nov 2025 :
Occurrence Remarks: Was just at dusk and still pretty warm ... heard rattling and finally located this guy. Small, maybe 1.5 ft, scooted across road and curled beneath bush alongside wash. Fairly calm - stopped rattling once I stopped lurching around trying to locate it - took lots pix and snake still tucked under bush when I drove away.; Coordinate Uncertainty in Meters: 193.00000.

Los Angeles, California: 34.600066, -117.851056: : 11/23/2025: Elizabeth Lockhart: 23 Nov 2025 ; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 34.541697, -115.050492: : 7/8/2022: Margaret Gallagher: 8 Jul 2022 :

Riverside, California: 33.664345, -115.80223: : 10/21/2025: James Bailey: 21 Oct 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Riverside, California: 33.909808, -116.654158: : 4/19/2026: tbargholz: 19 Apr 2026 ; Coordinate Uncertainty in Meters: 6.00000.

San Diego, California: 33.236628, -116.354775: : 4/24/2026: tzwimmer: 24 Apr 2026 ; Coordinate Uncertainty in Meters: 9.00000.

Riverside, California: 33.799741, -116.3982: : 11/5/2025: David Emmerson: 5 Nov 2025 ; Coordinate Uncertainty in Meters: 203.00000.

San Diego, California: 33.232715, -116.38708: : 11/12/2025: srood: 12 Nov 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Maricopa, Arizona: 33.4939, -112.717711: : 11/15/2025: aquanoun: 15 Nov 2025 ; Coordinate Uncertainty in Meters: 11.10000.

San Diego, California: 33.263038, -116.402542: : 11/13/2025: leifygriff: 13 Nov 2025 ; Coordinate Uncertainty in Meters: 5.00000.

Occurrence Remarks: lowk dead, moved it out of the road because I felt bad; Coordinate Uncertainty in Meters: 801.00000.

San Bernardino, California: 34.894997, -115.703562: : 5/16/2026: Michael Zelun Lee: 16 May 2026 ; Coordinate Uncertainty in Meters: 3.00000.

San Bernardino, California: 34.717077, -117.583412: : 3/26/2026: gisel_15: 26 Mar 2026 ; Coordinate Uncertainty in Meters: 28790.00000.

San Bernardino, California: 34.787293, -117.409195: : 3/26/2026: gisel_15: 26 Mar 2026 ; Coordinate Uncertainty in Meters: 28790.00000.

San Bernardino, California: 35.178933, -117.0084: : 5/24/2026: kyrifreeman: 24 May 2026 ; Coordinate Uncertainty in Meters: 28734.00000.

Imperial, California: 33.259201, -116.051402: : 5/2/2026: california_every_reptile: 2 May 2026 ; Coordinate Uncertainty in Meters: 28984.00000.

La Paz, Arizona: 33.592087, -113.76783: : 11/5/2025: michaeljbroughton: 5 Nov 2025 ; Coordinate Uncertainty in Meters: 4.00000.

Riverside, California: 33.877307, -116.76548: : 5/20/2026: Dayne: 20 May 2026 ; Coordinate Uncertainty in Meters: 28902.00000.

San Bernardino, California: 35.077136, -116.996624: : 10/23/2025: Sean Clark: 23 Oct 2025 ; Coordinate Uncertainty in Meters: 67007.00000.

San Diego, California: 33.243808, -116.38977: : 3/30/2026: weevilwizarding: 30 Mar 2026 ; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3994218768; Occurrence Remarks: Horns over the eyes and small stature.;; Coordinate Uncertainty in Meters: 28874.00000.

GBIFID: 1898842413; Occurrence Remarks: Photo by a security guard at The Reserve;; Coordinate Uncertainty in Meters: 22.00000.

San Bernardino, California: 34.967182, -115.703141: : 6/29/2026: Oonagh Degenhardt: 29 Jun 2026 ; Coordinate Uncertainty in Meters: 28762.00000.

Occurrence Remarks: DOR, only sign of a snake all night San Diego County; Coordinate Uncertainty in Meters: 28984.00000.

Riverside, California: 33.835015, -116.725109: : 8/28/2025: snakedude530: 28 Aug 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

San Diego, California: 33.3592, -116.392097: : 2/10/2026: sharonbur: 10 Feb 2026 ; Coordinate Uncertainty in Meters: 6.00000.

San Bernardino, California: 34.233558, -116.052069: : 9/18/2025: chickenboi717: 18 Sep 2025 ; Coordinate Uncertainty in Meters: 139.00000.

Riverside, California: 33.938428, -116.594794: : 2/25/2026: James Roberts: 25 Feb 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.824278, -116.326828: : 2/7/2026: Claudia Gomez: 7 Feb 2026 ; Coordinate Uncertainty in Meters: 6.00000.

San Diego, California: 33.257903, -116.300864: : 2/28/2026: Morgan Stickrod: 28 Feb 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Occurrence Remarks: Mojave sidewinder rattlesnake in their hunting lay.; Coordinate Uncertainty in Meters: 14317.00000.

Occurrence Remarks: Neonate from last fall, seen moving across the road. 1st of 6 road cruised tonight. Also saw 3 DORs. Crazy (and concerning) to see so many out this early in the year, although it makes sense given the record-breaking heat wave.; Coordinate Uncertainty in Meters: 28984.00000.

Occurrence Remarks: Resting on the road. 6th of 6 road cruised tonight. Also saw 3 DORs. Crazy (and concerning) to see so many out this early in the year, although it makes sense given the record-breaking heat wave.; Coordinate Uncertainty in Meters: 28984.00000.

Occurrence Remarks: Resting on the road. 5th of 6 road cruised tonight. Also saw 3 DORs. Crazy (and concerning) to see so many out this early in the year, although it makes sense given the record-breaking heat wave.; Coordinate Uncertainty in Meters: 28984.00000.

Riverside, California: 33.898427, -116.680255: : 5/12/2025: Floyd E. Hayes: 12 May 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.899303, -116.679594: : 5/12/2025: Floyd E. Hayes: 12 May 2025 ; Coordinate Uncertainty in Meters: 1.00000.

Occurrence Remarks: Typical Tracks; Coordinate Uncertainty in Meters: 2.00000.

Riverside, California: 33.910095, -116.670837: : 3/1/2026: tbargholz: 1 Mar 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Maricopa, Arizona: 33.304553, -112.3742: : 3/9/2026: Bridget Turner: 9 Mar 2026 ; Coordinate Uncertainty in Meters: 232.00000.

San Bernardino, California: 34.895256, -115.7041: : 3/27/2026: Lily Rice: 27 Mar 2026 ; Coordinate Uncertainty in Meters: 5.00000.

Riverside, California: 33.932417, -116.653178: : 3/14/2026: Lucas Ramirez: 14 Mar 2026 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.995237, -116.78627: : 3/14/2026: Lucas Ramirez: 14 Mar 2026 ; Coordinate Uncertainty in Meters: 28902.00000.

San Bernardino, California: 34.282193, -116.153317: : 3/14/2026: Christopher Reba: 14 Mar 2026 ; Coordinate Uncertainty in Meters: 28846.00000.

San Diego, California: 33.261365, -116.402795: : 3/3/2026: agoldber: 3 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.706248, -115.25007: : 3/4/2026: Zach Smith: 4 Mar 2026 ; Coordinate Uncertainty in Meters: 28930.00000.

San Bernardino, California: 34.794108, -116.343567: : 3/30/2026: Peri Lee Pipkin: 30 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.901985, -116.684898: : 4/9/2026: sangsterj: 9 Apr 2026 ; Coordinate Uncertainty in Meters: 4.00000.

San Bernardino, California: 34.343469, -116.160471: : 3/15/2026: Christopher Reba: 15 Mar 2026 ; Coordinate Uncertainty in Meters: 28846.00000.

Maricopa, Arizona: 33.28806, -112.030742: : 4/28/2026: John G. Phillips: 28 Apr 2026 ; Coordinate Uncertainty in Meters: 28984.00000.

Riverside, California: 33.902053, -116.655738: : 3/21/2026: c_merrylees: 21 Mar 2026 ; Coordinate Uncertainty in Meters: 13.00000.

Riverside, California: 33.610138, -116.265913: : 5/6/2026: Diana: 6 May 2026 ; Coordinate Uncertainty in Meters: 13.00000.

Riverside, California: 33.90733, -116.673012: : 5/7/2026: tbargholz: 7 May 2026 ; Coordinate Uncertainty in Meters: 3.00000.

San Bernardino, California: 34.897297, -115.707026: : 4/9/2026: Matthew Ferretti: 9 Apr 2026 ; Coordinate Uncertainty in Meters: 105.00000.

San Bernardino, California: 34.194151, -116.283005: : 3/20/2026: desertratttt: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 59.00000.

San Bernardino, California: 34.5535, -115.784747: : 4/11/2026: William Mason: 11 Apr 2026 ; Coordinate Uncertainty in Meters: 15.00000.

Imperial, California: 33.399792, -115.758444: : 11/9/2025: Sergey: 9 Nov 2025 ; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 34.917532, -116.508549: : 10/8/2025: Tessa McClain: 8 Oct 2025 ; Coordinate Uncertainty in Meters: 0.11000.

San Diego, California: 33.36548, -116.41572: : 4/24/2026: jhmartin28: 24 Apr 2026 ; Coordinate Uncertainty in Meters: 1.11000.

Riverside, California: 33.806993, -116.481031: : 3/28/2026: Lucas Ramirez: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 28902.00000.

Imperial, California: 33.399772, -115.758289: : 11/9/2025: Sergey: 9 Nov 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.824253, -116.326828: : 2/7/2026: fonxo: 7 Feb 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Maricopa, Arizona: 33.787103, -112.823953: : 9/18/2025: Jorge Aguilera: 18 Sep 2025 ; Coordinate Uncertainty in Meters: 28930.00000.

Maricopa, Arizona: 33.551814, -112.843715: : 9/18/2025: Jorge Aguilera: 18 Sep 2025 ; Coordinate Uncertainty in Meters: 28957.00000.

Los Angeles, California: 34.418706, -117.88723: : 9/23/2025: Olivia Miseroy: 23 Sep 2025 ; Coordinate Uncertainty in Meters: 28818.00000.

Riverside, California: 33.814572, -116.711321: : 9/22/2025: Jeremiah Degenhardt: 22 Sep 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.870007, -116.712306: : 9/22/2025: Jeremiah Degenhardt: 22 Sep 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.856178, -116.631616: : 9/22/2025: Jeremiah Degenhardt: 22 Sep 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Occurrence Remarks: Spotted under my porch.; Coordinate Uncertainty in Meters: 1.11000.

Riverside, California: 33.714108, -115.321053: : 9/30/2025: plantbasedbio: 30 Sep 2025 ; Coordinate Uncertainty in Meters: 7.00000.

La Paz, Arizona: 34.018986, -113.939287: : 5/11/2026: Carlos A. Armenta: 11 May 2026 ; Coordinate Uncertainty in Meters: 4.00000.

Occurrence Remarks: Stepped over whole retrieving pitfall data. No reaction from the snake, stayed partially buried, no rattle or lunging. Temperature was high 80s no winds, no clouds. Only consistently sandy area amongst silt patches at least in between transects. 1 individual; Coordinate Uncertainty in Meters: 2.00000.

San Bernardino, California: 35.082366, -115.986177: : 5/6/2026: Isaiah Woodard: 6 May 2026 ; Coordinate Uncertainty in Meters: 28734.00000.

San Bernardino, California: 34.840489, -115.609313: : 5/14/2026: mikeburchett: 14 May 2026 ; Coordinate Uncertainty in Meters: 28762.00000.

Kern, California: 35.119597, -117.861821: : 4/24/2026: Amanda Preece: 24 Apr 2026 ; Coordinate Uncertainty in Meters: 15.00000.

Riverside, California: 33.586268, -115.503978: : 3/19/2026: Cameron W Barrows: 19 Mar 2026 ; Coordinate Uncertainty in Meters: 15.00000.

Riverside, California: 33.907017, -116.673317: : 3/19/2026: tbargholz: 19 Mar 2026 ; Coordinate Uncertainty in Meters: 4.00000.

Occurrence Remarks: Tentative id, because I donΓÇÖt know if other species use sidewinding locomotion in soft sand, but sidewinder rattlesnake is the only species IΓÇÖve ever seen doing it.; Coordinate Uncertainty in Meters: 5.00000.

San Diego, California: 33.30083, -116.337547: : 3/20/2026: Mspiegelberg: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

San Diego, California: 33.301717, -116.385108: : 3/20/2026: Mspiegelberg: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 5.00000.

San Bernardino, California: 34.195222, -116.286087: : 3/20/2026: skinkus-jinkus: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 32.00000.

Occurrence Remarks: The ground squirrels notified me of the snake a few feet from me.; Coordinate Uncertainty in Meters: 5.00000.

Riverside, California: 33.602944, -115.50655: : 3/19/2026: Sendy Hern├índez Orellana Barrows: 19 Mar 2026 ; Coordinate Uncertainty in Meters: 5.00000.

Occurrence Remarks: On trail with crushed head; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: DOR by me while swerving to avoid the already DOR coachwhip (https://www.inaturalist.org/observations/343757289) just before it...sigh...; Coordinate Uncertainty in Meters: 15.00000.

Riverside, California: 33.892896, -116.683275: : 3/25/2026: yichen_g: 25 Mar 2026 ; Coordinate Uncertainty in Meters: 50.00000.

Riverside, California: 33.912704, -116.668147: : 3/24/2026: stinkmosh: 24 Mar 2026 ; Coordinate Uncertainty in Meters: 61.00000.

San Bernardino, California: 35.010991, -115.473355: : 3/25/2026: truongbenson: 25 Mar 2026 ; Coordinate Uncertainty in Meters: 194.00000.

San Diego, California: 33.246057, -116.201203: : 3/16/2026: Tom Mills: 16 Mar 2026 ; Coordinate Uncertainty in Meters: 28984.00000.

San Diego, California: 33.312487, -116.388375: : 3/16/2026: Tom Mills: 16 Mar 2026 ; Coordinate Uncertainty in Meters: 28984.00000.

San Diego, California: 33.237043, -116.200991: : 3/28/2026: Arquitecto Defecto: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 979.00000.

San Diego, California: 33.255328, -116.381431: : 3/28/2026: mesteve: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Riverside, California: 33.906846, -116.649628: : 3/28/2026: Jason Guo Θâ¡τ┤½σ«╕: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 128.00000.

San Bernardino, California: 35.021387, -117.033243: : 3/29/2026: Jo├úo Vicente: 29 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: 1st pic shot by Jason; Coordinate Uncertainty in Meters: 3.00000.

Maricopa, Arizona: 33.680681, -112.821512: : 3/23/2026: Eric Hough: 23 Mar 2026 ; Coordinate Uncertainty in Meters: 28930.00000.

San Bernardino, California: 35.16333, -115.816345: : 3/22/2026: californican: 22 Mar 2026 ; Coordinate Uncertainty in Meters: 6.00000.

San Bernardino, California: 35.164097, -115.818632: : 3/22/2026: californican: 22 Mar 2026 ; Coordinate Uncertainty in Meters: 6.00000.

San Diego, California: 33.353256, -116.383697: : 3/31/2026: weevilwizarding: 31 Mar 2026 ; Coordinate Uncertainty in Meters: 466.00000.

La Paz, Arizona: 33.612617, -113.50502: : 3/25/2026: kryschiana: 25 Mar 2026 ; Coordinate Uncertainty in Meters: 2.00000.

San Bernardino, California: 34.732732, -117.407627: : 4/10/2026: tombaxter: 10 Apr 2026 ; Coordinate Uncertainty in Meters: 28790.00000.

San Bernardino, California: 34.653794, -117.580001: : 4/8/2026: tombaxter: 8 Apr 2026 ; Coordinate Uncertainty in Meters: 28790.00000.

Riverside, California: 33.912347, -116.432822: : 3/24/2026: judytop: 24 Mar 2026 ; Coordinate Uncertainty in Meters: 10.00000.

San Bernardino, California: 35.159641, -115.802086: : 3/22/2026: californican: 22 Mar 2026 ; Coordinate Uncertainty in Meters: 6.00000.

Riverside, California: 33.873415, -115.900992: : 3/16/2026: clarksnutcracker_limberpine_shipper: 16 Mar 2026 ; Coordinate Uncertainty in Meters: 52530.00000.

San Bernardino, California: 34.55259, -115.77945: : 4/11/2026: Bradley Rydholm: 11 Apr 2026 ; Coordinate Uncertainty in Meters: 1785.00000.

Occurrence Remarks: Maricopa County; Coordinate Uncertainty in Meters: 28930.00000.

Riverside, California: 33.555122, -114.684271: : 4/8/2026: Austin R. Kelly: 8 Apr 2026 ; Coordinate Uncertainty in Meters: 28957.00000.

San Bernardino, California: 34.896243, -115.70583: : 5/1/2025: Robert: 1 May 2025 ; Coordinate Uncertainty in Meters: 151.00000.

Occurrence Remarks: Snake found dead near a trail at JTNP. Only the rear half of the snake was present, the front half was missing.; Coordinate Uncertainty in Meters: 28930.00000.

San Diego, California: 33.323782, -116.367727: : 2/28/2026: loraxspotting: 28 Feb 2026 ; Coordinate Uncertainty in Meters: 0.11000.

San Diego, California: 33.304328, -116.214991: : 6/12/2026: Jonathan Hakim: 12 Jun 2026 ; Coordinate Uncertainty in Meters: 10.00000.

San Diego, California: 33.341968, -116.368343: : 2/28/2026: loraxspotting: 28 Feb 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Maricopa, Arizona: 33.87931, -112.153949: : 12/4/2025: Andrew Langdon: 4 Dec 2025 ; Coordinate Uncertainty in Meters: 6.00000.

Occurrence Remarks: Found dead and decapitated, half-buried.; Coordinate Uncertainty in Meters: 28930.00000.

San Bernardino, California: 34.214875, -116.334738: : 6/9/2026: ymp: 9 Jun 2026 ; Coordinate Uncertainty in Meters: 7.00000.

Riverside, California: 33.782653, -115.797128: : 6/17/2026: Danner Chartier: 17 Jun 2026 ; Coordinate Uncertainty in Meters: 5.00000.

San Bernardino, California: 34.19404, -116.283036: : 7/8/2026: desertratttt: 8 Jul 2026 ; Coordinate Uncertainty in Meters: 25.00000.

Riverside, California: 33.902745, -116.64405: : 7/13/2026: Cathy Wiley: 13 Jul 2026 ; Coordinate Uncertainty in Meters: 2.00000.

San Diego, California: 33.283163, -116.099464: : 6/27/2026: matt_mca: 27 Jun 2026 ; Coordinate Uncertainty in Meters: 2.00000.

San Bernardino, California: 34.720159, -117.567489: : 7/24/2026: D─ôtto: 24 Jul 2026 ; Coordinate Uncertainty in Meters: 28790.00000.

Riverside, California: 33.715387, -115.320305: : 6/17/2026: datafoya2314: 17 Jun 2026 ; Coordinate Uncertainty in Meters: 3.00000.

San Bernardino, California: 34.88848, -115.71661: : 6/29/2026: Jeremiah Degenhardt: 29 Jun 2026

San Bernardino, California: 34.91647, -115.714329: : 4/19/2026: Zooey Sandel: 19 Apr 2026 ; Coordinate Uncertainty in Meters: 28762.00000.

San Diego, California: 33.235082, -116.384621: : 9/17/2025: GnatureGoof: 17 Sep 2025 ; Coordinate Uncertainty in Meters: 476.00000.

Riverside, California: 33.925039, -116.317404: : 6/15/2026: braulio-oros: 15 Jun 2026 ; Coordinate Uncertainty in Meters: 28902.00000.

San Bernardino, California: 34.194026, -116.282942: : 6/21/2026: desertratttt: 21 Jun 2026 ; Coordinate Uncertainty in Meters: 23.00000.

Riverside, California: 33.916467, -116.658569: : 4/20/2026: Zooey Sandel: 20 Apr 2026 ; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 1848773429; Occurrence Remarks: Slept in coil;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3455725476; Occurrence Remarks: Maybe not visible in the photos but this baby had little horns above its eyes.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 3456401564; Occurrence Remarks: Colorado Desert Sidewinder (Crotalus cerastes laterorepens), La Paz County, Arizona;; Coordinate Uncertainty in Meters: 5000.00000.

GBIFID: 3455383058; Occurrence Remarks: Colorado Desert Sidewinder (Crotalus ceraster laterorepens), La Paz County, Arizona;; Coordinate Uncertainty in Meters: 5000.00000.

GBIFID: 3455621397; Occurrence Remarks: Neonate Colorado Desert Sidewinder (Crotalus cerastes laterorepens), eastern Riverside County, California;; Coordinate Uncertainty in Meters: 4000.00000.

GBIFID: 3456589736; Occurrence Remarks: Adult Colorado Desert Sidewinder (Crotalus cerastes laterorepens), eastern Riverside County, California;; Coordinate Uncertainty in Meters: 4000.00000.

GBIFID: 3456948483; Occurrence Remarks: DOR Colorado Desert Sidewinder (Crotalus cerasted laterorepens), eastern Riverside County, California;; Coordinate Uncertainty in Meters: 4000.00000.

San Bernardino, California: 35.160019, -115.444129: : 3/24/2026: mikeburchett: 24 Mar 2026 ; Coordinate Uncertainty in Meters: 28734.00000.

GBIFID: 3759621969; Occurrence Remarks: 76 degrees;; Coordinate Uncertainty in Meters: 981.00000.

GBIFID: 3759169060; Occurrence Remarks: There are two individuals. Cream colored on top, gravel gray/brown on bottom. *Willis Palms Loop Trail, Coachella Valley Preserve, Thousand Palms CA.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3759901130; Occurrence Remarks: Sign.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 3456476060; Occurrence Remarks: Colorado Desert Sidewinder (Crotalus cerastes laterorepens), eastern Riverside County, California;; Coordinate Uncertainty in Meters: 4000.00000.

San Diego, California: 33.258179, -116.365813: : 1/16/2022: Larry Hendrickson, California State Parks: 16 Jan 2022 :

GBIFID: 3759539704; Occurrence Remarks: Hit by car, very nearly dead, but hanging on to a bit of life. Soon invenomated and killed itself. Salvaged under permits to become a university specimen. 12 scale rows from ventrals up to and including dorsal row, + 11 on other side (excluding dorsal row);; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 891093100; Occurrence Remarks: Roadkilled.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3759727372; Occurrence Remarks: Among numerous small individuals observed in the area. Must have been a nest that hatched nearby with the warmer weather. Presumed to be C. cerastes cerastes;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 1839259990; Occurrence Remarks: Predation of a desert iguana by a sidewinder. There were two desert iguanas, one in the open and one under the shrub; the one in the shrub had been bitten, and was eventually eaten by the sidewinder (the other lizard wandered off). This is also posted as a desert iguana (iNaturalist observation #11405785);; Coordinate Uncertainty in Meters: 28902.00000.

San Bernardino, California: 35.052301, -117.364606: : 4/28/2022: kellyalycemcdonald: 28 Apr 2022 :

San Bernardino, California: 34.400103, -116.858179: : 5/13/2022: Nicholus ledbetter: 13 May 2022 :

GBIFID: 3784847439; Occurrence Remarks: During Lunar eclipse spotted this sidewinder as I was taking video of the Long-nosed snake leaving the roadway.;; Coordinate Uncertainty in Meters: 61.00000.

San Bernardino, California: 35.043595, -116.285852: : 5/1/2022: Shanelle Wikramanayake: 1 May 2022 :

GBIFID: 3785004789; Occurrence Remarks: Adult on edge of 111 with moon rise.;; Coordinate Uncertainty in Meters: 122.00000.

San Bernardino, California: 34.814617, -117.0365: : 5/18/2022: bighornsheepgirl: 18 May 2022 :

GBIFID: 3773722251; Occurrence Remarks: I saw 2 in about 100 ft of each other;; Coordinate Uncertainty in Meters: 28734.00000.

San Bernardino, California: 35.056036, -116.08021: : 5/22/2022: bighornsheepgirl: 22 May 2022 :
GBIFID: 3802321755; Occurrence Remarks: 91 degrees at 8:46pm.;; Coordinate Uncertainty in Meters: 28734.00000.

GBIFID: 891060819; Occurrence Remarks: 9:00 PM, near roadside. Location uncertain, but likely within 10 miles of Desert Studies Center.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3860137835; Occurrence Remarks: A friend in the Coachella Valley sent me this photo for I.D. This sidewinder rattlesnake had been resting behind a large potted plant on her front porch. She called animal control and was told they would relocate it to somewhere safer. Across the street from this housing development (Sun City Palm Desert) is a large sand dune preserve called the Coachella Valley Preserve where there are many Sidewinders. We often seen their J shaped tracks in the sand. Sidewinder (Crotalus cerastes), A.k.a. horned rattlesnake and sidewinder rattlesnake, is a venomous pit viper. It is found in the desert regions of the southwestern United States and northwestern Mexico. Prominent horn over each eye is characteristic of sidewinders. The common name sidewinder alludes to its unusual form of locomotion, which is thought to give it traction on windblown desert sand, but this peculiar locomotor specialization is used on any substrate over which the sidewinder can move rapidly. As its body progresses over loose sand, it forms a letter J-shaped impression, with the tip of the hook pointing in the direction of travel. Rattlesnakes are typically described as poisonous, but they are actually venomous. A poisonous snake is one that is harmful to eat. A venomous snake injects dangerous venom into its victim. Rattlesnakes are important members of the natural community. They will not attack, but if disturbed or cornered, they will defend themselves. Reasonable watchfulness should be sufficient to avoid snakebite. Give them distance and respect. Rattlesnakes are also among the most reasonable forms of dangerous wildlife: their first line of defense is to remain motionless; if you surprise them or cut off their retreat, they offer an audio warning; if you get too close, they head for cover. Venom is intended for prey so theyre reluctant to bite, and 25 to 50 percent of all bites are dry - no venom is injected. Leslie Anthony. Snakebit: Confessions of a Herpetologist. Greystone Books, 2008. Guide to the Amphibians and Reptiles of California for ssp. rangemap;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3873157997; Occurrence Remarks: 95 degrees at 8:21pm. Sitting right outside its burrow;; Coordinate Uncertainty in Meters: 28790.00000.

GBIFID: 3892395468; Occurrence Remarks: Pretty sure this was left by a sidewinder. Diameter of the circular depression was about 4-5 inches.;; Coordinate Uncertainty in Meters: 83.00000.

GBIFID: 1848779687; Occurrence Remarks: Found this sidewinder a few hundred yards from the first one.;; Coordinate Uncertainty in Meters: 604.00000.

GBIFID: 1850907775; Occurrence Remarks: Tracks fresh enough to see scales. Laid down in parallel, ended at a burrow.;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 3902041232; Occurrence Remarks: found and photod on night drive; digitized from slide;; Coordinate Uncertainty in Meters: 244.00000.

GBIFID: 1880471292; Occurrence Remarks: Location is not exact - these were all taken somewhere on Ft. Irwin property when I worked on a desert tortoise project;; Coordinate Uncertainty in Meters: 14903.00000.

GBIFID: 1850929854; Occurrence Remarks: Location is not exact - these were all taken somewhere on Ft. Irwin property when I worked on a desert tortoise project;; Coordinate Uncertainty in Meters: 14903.00000.

GBIFID: 3903551766; Occurrence Remarks: Roadkill;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 3912248703; Occurrence Remarks: Roadkill;; Coordinate Uncertainty in Meters: 28930.00000.

GBIFID: 3903217415; Occurrence Remarks: Cruised at ~93 degrees F;; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 3923732433; Occurrence Remarks: Colorado Desert or Sonoran Sidewinder?;; Coordinate Uncertainty in Meters: 30247.00000.

GBIFID: 3925472582; Occurrence Remarks: Crossing a sandy/dirt trail around 10pm;; Coordinate Uncertainty in Meters: 491.00000.

GBIFID: 3912455596; Occurrence Remarks: Basking in the sand around 9:10 am near location.;; Coordinate Uncertainty in Meters: 3173.00000.

GBIFID: 3947303724; Occurrence Remarks: Lifer sidewinder;; Coordinate Uncertainty in Meters: 1253.00000.

GBIFID: 3912442716; Occurrence Remarks: Basking in the sand about 9 am. Near location. Calm.;; Coordinate Uncertainty in Meters: 2989.00000.

GBIFID: 3963396856; Occurrence Remarks: was a juvenile;; Coordinate Uncertainty in Meters: 15.00000.

GBIFID: 1890045790; Occurrence Remarks: almost stepped on this guy.;; Coordinate Uncertainty in Meters: 569.00000.

GBIFID: 4076230035; Occurrence Remarks: Observed by Morongo Valley resident Danni while pulling weeds in Landers. 57F;; Coordinate Uncertainty in Meters: 122.00000.

Riverside, California: 33.74415, -115.814417: : 3/11/2023: Sendy Hern├índez Orellana Barrows: 11 Mar 2023 :

San Bernardino, California: 34.319472, -116.200675: : 8/9/2018: Spider Jane Fawke: 9 Aug 2018 :

GBIFID: 4096669512; Occurrence Remarks: Lifer!;; Coordinate Uncertainty in Meters: 28762.00000.

San Bernardino, California: 34.887066, -115.715264: : 4/22/2023: Jeremiah Degenhardt: 22 Apr 2023 :

GBIFID: 1899779297; Occurrence Remarks: Road Cruised;; Coordinate Uncertainty in Meters: 244.00000.

GBIFID: 4120919048; Occurrence Remarks: Found in Ambush position. Temp was 80 degrees.;; Coordinate Uncertainty in Meters: 28790.00000.

San Bernardino, California: 35.01817, -115.65898: : 4/22/2023: Jeremiah Degenhardt: 22 Apr 2023 :
GBIFID: 4936392460; Occurrence Remarks: Found DOR;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 4103324747; Occurrence Remarks: DOR; CNC 2023;; Coordinate Uncertainty in Meters: 30.00000.

GBIFID: 4127290070; Occurrence Remarks: Found dead on road;; Coordinate Uncertainty in Meters: 303.00000.

GBIFID: 1913160600; Occurrence Remarks: The single coolest snake that I have gotten to encounter was this Sidewinder. My son was especially excited to find the cute rattlesnake.;; Coordinate Uncertainty in Meters: 7813.00000.

GBIFID: 4138192845; Occurrence Remarks: Tracks of a sidewinder sleeping;; Coordinate Uncertainty in Meters: 4.00000.

San Bernardino, California: 34.202036, -115.915383: : 9/25/2018: William Michael Brown: 25 Sep 2018 :
GBIFID: 1949982560; Occurrence Remarks: its dusk and my friend saw this just off our porch. it was very upset and making a rattling noise. ive lived out here six months and have seen just one red racer and a garter snake! the black rear end seems like evidence it was a WDR.;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 4162263175; Occurrence Remarks: Young sidewinder, moved off road but went into bushes before i could get any clearer pics;; Coordinate Uncertainty in Meters: 14286.00000.

GBIFID: 1122958915; Occurrence Remarks: Roadkill, super flat;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4171789813; Occurrence Remarks: Gravid female;; Coordinate Uncertainty in Meters: 16.00000.

Riverside, California: 33.981505, -116.394554: : 8/9/2023: Alexander Gregory Mason: 9 Aug 2023 :

Riverside, California: 33.818146, -116.280746: : 8/14/2023: Alexander Gregory Mason: 14 Aug 2023 :

GBIFID: 1914344312; Occurrence Remarks: Terrible photos, but this was definitely a baby sidewinder;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4407631411; Occurrence Remarks: Neonate;; Coordinate Uncertainty in Meters: 28930.00000.

GBIFID: 1946330134; Occurrence Remarks: A young sidewinder spotted on top of Kelso Dunes at the Mojave National Preserve.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1945457957; Occurrence Remarks: Juvenile found atop of one of the large sand dunes.;; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.525579, -114.753343: : 10/8/2023: Alexander Gregory Mason: 8 Oct 2023 :

San Bernardino, California: 34.613152, -115.973238: : 10/11/2023: Boaz Benaiah Solorio: 11 Oct 2023 :

GBIFID: 4431251055; Occurrence Remarks: DOR. Tiny.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4430632906; Occurrence Remarks: 2 rattlesnakes possibly mating?;; Coordinate Uncertainty in Meters: 48.00000.

Riverside, California: 33.763589, -116.2673: : 11/6/2023: Jeremiah Degenhardt: 6 Nov 2023 :

GBIFID: 4430794076; Occurrence Remarks: In net temporarily to be moved off the road. So close to being hit by a vehicle.;; Coordinate Uncertainty in Meters: 15.00000.

GBIFID: 4436244265; Occurrence Remarks: Numerous tracks in the vicinity;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4440765571; Occurrence Remarks: Tracks on a sandy road.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4500884095; Occurrence Remarks: Sandy wash in creosote scrub desert.;; Coordinate Uncertainty in Meters: 573.00000.

GBIFID: 4607207121; Occurrence Remarks: baby sidewinder + itΓÇÖs track;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4606935627; Occurrence Remarks: Saved from Canal, young adult;; Coordinate Uncertainty in Meters: 188.00000.

GBIFID: 4607151071; Occurrence Remarks: Under cover object;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 4847225161; Occurrence Remarks: Moved off the road with snake hook to avoid becoming roadkill.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4852905661; Occurrence Remarks: Neonate/juvenile with leftover skin from shed still hanging over rattle/tip of tail.;; Coordinate Uncertainty in Meters: 28930.00000.

GBIFID: 4851883741; Occurrence Remarks: Was moving sideways;; Coordinate Uncertainty in Meters: 3.00000.

San Bernardino, California: 35.075531, -115.578317: : 4/24/2024: Professor Brian Todd at UC Davis: 24 Apr 2024 :
GBIFID: 4853124801; Occurrence Remarks: Dead on road;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4852785213; Occurrence Remarks: Half-grown individual;; Coordinate Uncertainty in Meters: 28930.00000.

San Bernardino, California: 34.894925, -115.70285: : 4/28/2024: Robert Daniel Avila: 28 Apr 2024 :

GBIFID: 4855464686; Occurrence Remarks: Multiple individuals pictured. 5 total sidewinders found.;; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.60265, -115.50656: : 3/19/2026: Colin Barrows: 19 Mar 2026 ; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 4855376657; Occurrence Remarks: A very buzzy one.;; Coordinate Uncertainty in Meters: 28762.00000.

GBIFID: 2234778168; Occurrence Remarks: just 0.3 miles further down the road than the previous observation;; Coordinate Uncertainty in Meters: 5.00000.

Riverside, California: 33.602933, -115.506569: : 3/19/2026: P. Johnson: 19 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4872307498; Occurrence Remarks: Can see the crests above its eyes, caught some sidewinding on video. Super sick, lifer for me!;; Coordinate Uncertainty in Meters: 28762.00000.

GBIFID: 4872132721; Occurrence Remarks: tracks;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 4875056280; Occurrence Remarks: young individual born last August.;; Coordinate Uncertainty in Meters: 1010.00000.

San Bernardino, California: 34.325227, -116.584868: : 6/2/2024: Spider Jane Fawke: 2 Jun 2024 :

GBIFID: 2236223605; Occurrence Remarks: aw yes;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 4908977102; Occurrence Remarks: Neonate;; Coordinate Uncertainty in Meters: 12.00000.

GBIFID: 2237433975; Occurrence Remarks: Tracks.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4908758384; Occurrence Remarks: Such cool animals, itΓÇÖs unreal how much I love seeing them. This one was so chill, only moved and gave a little rattle when I put them down after I moved them off the road;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 4919310121; Occurrence Remarks: Early morning sidewinder made sure we knew he was there.;; Coordinate Uncertainty in Meters: 675.00000.

GBIFID: 2237447764; Occurrence Remarks: I think it was a juvenile. Maybe 40cm long?;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 2238842559; Occurrence Remarks: CNC 2019; DOR;; Coordinate Uncertainty in Meters: 10.00000.

San Diego, California: 33.323853, -116.367653: : 3/16/2026: jhmartin28: 16 Mar 2026 ; Coordinate Uncertainty in Meters: 5.00000.

San Diego, California: 33.29249, -116.297928: : 4/26/2019: Bradford Hollingsworth: 26 Apr 2019 :
GBIFID: 2238843341; Occurrence Remarks: CNC 2019; LOR;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 4924149064; Occurrence Remarks: Gorgeous younger individual I found on my concrete pad, the pictures donΓÇÖt do the colors on him any justice;; Coordinate Uncertainty in Meters: 83.00000.

GBIFID: 4935868677; Occurrence Remarks: Lifer! My first attempt at cruising them on this road, a success. One of two found on the night in question, both AOR Unfortunately increasing road traffic in recent years due to the adjacent Tartesso and Sun City Festival developments has likely already substantially impacted this population, and the inchoate Teravalis development in the middle of the parkway will likely reduce their numbers even further :(;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4936718086; Occurrence Remarks: Found dead in swimming pool.;; Coordinate Uncertainty in Meters: 9893.00000.

GBIFID: 4925893316; Occurrence Remarks: Juvenile.;; Coordinate Uncertainty in Meters: 28734.00000.

GBIFID: 4945461427; Occurrence Remarks: DOR; must have been hit in between my passes. Collected but not preserved.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4945496131; Occurrence Remarks: DOR; collected and preserved;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4945592783; Occurrence Remarks: AOR; slow night;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4936108754; Occurrence Remarks: Pretty large specimen, between 20 and 24 inches. Very well behaved as well;; Coordinate Uncertainty in Meters: 45.00000.

GBIFID: 1322994784; Occurrence Remarks: Located near a mountain side under a rock and bush. Rocky mountain side around 10:30AM. Temperature was warm out but cool in shade as clouds get mixing up sun exposure.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4945945742; Occurrence Remarks: A Young Sidewinder was caught on my patio and released near the edge of the nearby Coachella Valley Preserve. It is approximately 15 cm long.;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 4936972768; Occurrence Remarks: AOR; cruised with @birdnerd10; duplicate of one of his observations Spotted in the left lane actively crossing the road right as we finally gave up on the species and began the drive back to Scottsdale. Glad we could move it across in time; traffic on this stretch of road remains significant even in the late hours due to the new developments West of the White Tanks.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 1227738157; Occurrence Remarks: Crotalus cerastes This sidewinder was found during our field trip to the Granite Mountains Reserve (specifically at Amboy Crater). The area was dry, sandy, with large masses of volcanic rock. The day was bright with clear skies. The temperature was around mid/high 90s (Fahrenheit).;; Coordinate Uncertainty in Meters: 1786.00000.

GBIFID: 4953109273; Occurrence Remarks: Dude, IΓÇÖm not gonna lie these are becoming my favorite snake theyΓÇÖre so chill. I need to set up my nice camera with a strobe so I can get a really good photo session next time;; Coordinate Uncertainty in Meters: 28790.00000.

GBIFID: 4952452550; Occurrence Remarks: Had 5 rattle segments.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2242978439; Occurrence Remarks: Notice that there are two snakes;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1227768073; Occurrence Remarks: With Desert Ecology Class.;; Coordinate Uncertainty in Meters: 23260.00000.

GBIFID: 2251891028; Occurrence Remarks: looked like a juvenile;; Coordinate Uncertainty in Meters: 122.00000.

GBIFID: 5036893780; Occurrence Remarks: Found dying on road; about 1.5 hr later, after it died, I moved it to sand for a second photo.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2251926768; Occurrence Remarks: looked like baby or juvenile, curled up under log;; Coordinate Uncertainty in Meters: 61.00000.

GBIFID: 2251979122; Occurrence Remarks: Notice two snakes;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3090532513; Occurrence Remarks: tracks going up sand dune;; Coordinate Uncertainty in Meters: 4.00000.

San Bernardino, California: 35.148711, -116.284903: : 3/24/2025: Alexander Gregory Mason: 24 Mar 2025 :

GBIFID: 2251978294; Occurrence Remarks: 2 sidewinder rattlesnakes;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 5133759747; Occurrence Remarks: DOR male;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 5133667161; Occurrence Remarks: Such a cool snake! Found in the middle of the road; made it across safe and sound.;; Coordinate Uncertainty in Meters: 1421.00000.

GBIFID: 1253305077; Occurrence Remarks: Roughly 8;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 5133327232; Occurrence Remarks: Technically maybe not dead yet but they were really bad off and I doubt they survive their hit. Shame, a really nice one;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 5133425118; Occurrence Remarks: Finally a live snake bro, third times the charm;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 2269315485; Occurrence Remarks: dead on road;; Coordinate Uncertainty in Meters: 28984.00000.

San Bernardino, California: 35.019546, -116.121208: : 5/2/2025: Jeremiah Degenhardt: 2 May 2025 :

GBIFID: 2283149542; Occurrence Remarks: Alive, on road;; Coordinate Uncertainty in Meters: 28762.00000.

GBIFID: 5168319151; Occurrence Remarks: Suspected track;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 5167692838; Occurrence Remarks: Found on the road. Photo 5 is as found.;; Coordinate Uncertainty in Meters: 28734.00000.

GBIFID: 1890727644; Occurrence Remarks: These snakes were abundant in this area just after dark. - https://www.herpmapper.org/voucher/39000/full.jpg;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 1901088578; Occurrence Remarks: My first cerastes! Found after midnight on a quick detour of the interstate. - https://www.herpmapper.org/voucher/6118/full.jpg;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 5216552247; Occurrence Remarks: Rescued and moved from construction site to adjacent wash;; Coordinate Uncertainty in Meters: 772.00000.

GBIFID: 5238341678; Occurrence Remarks: Found on the road. Moved off to shoulder for safety;; Coordinate Uncertainty in Meters: 172.00000.

GBIFID: 5231830641; Occurrence Remarks: DOR ;(;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 2422876855; Occurrence Remarks: Look how long this snake trail goes on for!;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 5230740700; Occurrence Remarks: Seen on side of road, moved to safer spot;; Coordinate Uncertainty in Meters: 2.00000.

GBIFID: 3090558578; Occurrence Remarks: After taking 3 or so photos it decided that was enough and retreated back into the burrow (second photo) while giving a little rattle;; Coordinate Uncertainty in Meters: 143.00000.

GBIFID: 2429565665; Occurrence Remarks: tracks, resting sidewinder, previous resting spot;; Coordinate Uncertainty in Meters: 1136.00000.

GBIFID: 4950557577; Occurrence Remarks: Night of sidewinders, saw 6 (2 DOR) upload 2;; Coordinate Uncertainty in Meters: 88.00000.

GBIFID: 4950470378; Occurrence Remarks: Night of sidewinders, saw 6 (2 dor) upload 2;; Coordinate Uncertainty in Meters: 1225.00000.

GBIFID: 891026728; Occurrence Remarks: Observed on the road at night. Conditions were windy and temperatures were high, staying in the 90s until midnight.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2423178992; Occurrence Remarks: Found in burrow on Creosote flat. Remained in (or returned to) this burrow for several days.;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 2465248494; Occurrence Remarks: The first photo is the ΓÇ£signature JΓÇ¥ of the desert sidewinder Track sign;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 891026901; Occurrence Remarks: An adult found on the road at night.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2576280687; Occurrence Remarks: Young female perhaps just ate;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2423179020; Occurrence Remarks: Found and remained in this position, early evening on Creosote flat.;; Coordinate Uncertainty in Meters: 28984.00000.

GBIFID: 891723524; Occurrence Remarks: Another sidewinder observed on the same windy, hot night.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 891723540; Occurrence Remarks: Another sidewinder observed on the road at night.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2576354399; Occurrence Remarks: Baby sidewinder found coiled underneath a dried, dead shrub.;; Coordinate Uncertainty in Meters: 299.00000.

San Diego, California: 33.310063, -116.328402: : 3/10/2020: Larry Hendrickson, California State Parks: 10 Mar 2020 :

GBIFID: 2576438793; Occurrence Remarks: Likely Female;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 2579310072; Occurrence Remarks: When I found this sign in 2018, I thought it was human-made. But any other human sign was absent, which should not have been the case, given the substrate. It was only until recently I relocated this photo and realized what it was. Compare with 4th photo here https://www.inaturalist.org/observations/34286258;; Coordinate Uncertainty in Meters: 463.00000.

GBIFID: 2609297749; Occurrence Remarks: 8 snakes of 7 species seen on this night;; Coordinate Uncertainty in Meters: 28762.00000.

GBIFID: 2579334687; Occurrence Remarks: Hiding under board;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 1323033115; Occurrence Remarks: Anza-Borrego SP - California;; Coordinate Uncertainty in Meters: 12448.00000.

GBIFID: 2611185410; Occurrence Remarks: Juvenile tracks;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2611210174; Occurrence Remarks: Juvenile;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 2619969132; Occurrence Remarks: This lot is in the process of being developed despite the presence of endangered Coachella Valley Fringe-toed Lizards, which I have seen here all three times I have visited the site between 2009 and 2018. Approximately half the site is already destroyed with the rest now more vulnerable to kestrals, cats, and other predation. I write on the issue more in: Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 2619900250; Occurrence Remarks: Dead in road. :(;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2620045019; Occurrence Remarks: You cant see its eyebrows but if I could upload the video you would definitely see it is a sidewinder. Really beautiful, sharp patterning on this one, maybe a fresh molt.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2611231569; Occurrence Remarks: Found alongside road while cruising approximately 15 mph. Slight wind and temperature 75-80 degrees F;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1453209965; Occurrence Remarks: Tipton Road between I-10 and SR-111, Riverside County, CA; 24 August 1991;; Coordinate Uncertainty in Meters: 100.00000.

San Bernardino, California: 34.892822, -115.696877: : 5/8/2020: jenniferofthemeadow: 8 May 2020 :

GBIFID: 2626377260; Occurrence Remarks: Juvenile drinking from its coils during a surprise rain storm.;; Coordinate Uncertainty in Meters: 704.00000.

GBIFID: 2626377632; Occurrence Remarks: Moved off the road.;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 2626354497; Occurrence Remarks: Nudged off the road.;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 3067797977; Occurrence Remarks: In attempt to get this snake off the road away from an incoming car it shot into a hole, so unfortunately only got a blurry photo.;; Coordinate Uncertainty in Meters: 128.00000.

San Bernardino, California: 34.98157, -115.514891: : 5/6/2011: David Greenberg, PhD: 6 May 2011 :

GBIFID: 891031223; Occurrence Remarks: Maricopa County, AZ;; Coordinate Uncertainty in Meters: 28957.00000.

GBIFID: 4936352177; Occurrence Remarks: Jawbone Canyon A little guy--maybe a foot long;; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 2826459364; Occurrence Remarks: Insitu as discovered by my daugher. Chuckwalla also found under large cap rock.;; Coordinate Uncertainty in Meters: 3906.00000.

GBIFID: 2851046377; Occurrence Remarks: Very still. In an indent in the ground so that is was level with the ground. Non aggressive even with a human and dog passing by within a foot. Appeared to have 7 rattles.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1453467258; Occurrence Remarks: Young female, under burrow bush in morning rain, ocotillo wells svra;; Coordinate Uncertainty in Meters: 28984.00000.

San Bernardino, California: 34.273684, -116.395395: : 7/8/2020: Spider Jane Fawke: 8 Jul 2020 :

GBIFID: 2851111410; Occurrence Remarks: Very gravid sidewinder, found a short distance away from the road. Very relaxed, never attempted to move away or rattle for the short time we observed it.;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 2850731392; Occurrence Remarks: Sign: Tracks.;; Coordinate Uncertainty in Meters: 7.00000.

GBIFID: 2868268369; Occurrence Remarks: Hiding in the house.;; Coordinate Uncertainty in Meters: 31.00000.

GBIFID: 2898328665; Occurrence Remarks: DOR Adult still moving. Sidewinder from the Colorado Desert :);; Coordinate Uncertainty in Meters: 244.00000.

GBIFID: 899968926; Occurrence Remarks: Found a bunch of sidewinder tracks (along with many other animal tracks) and nearby was this little one at the front of its burrow. Made my day for sure.;; Coordinate Uncertainty in Meters: 28762.00000.

GBIFID: 899978235; Occurrence Remarks: 2nd sidewinder of night, 1st was DOR (no pics), this one was alive and striking but was able to get pics.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 910495309; Occurrence Remarks: I didnt find this myself but the guy who did let me take a pic, pretty cool partial striped sidewinder.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3018053724; Occurrence Remarks: Scanned from old slide. Date is correct; time is not. Location is from notes and memory, and thus imprecise.;; Coordinate Uncertainty in Meters: 892.00000.

GBIFID: 3031691340; Occurrence Remarks: Nighttime drive along the main road looking for snakes. Observation occurred on the roadway within the location circle.;; Coordinate Uncertainty in Meters: 10241.00000.

GBIFID: 911498541; Occurrence Remarks: Herpetofaunal inventory of the Old Woman Mountains, UCLA Field Biology Course;; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 35.138211, -116.1065: : 5/6/2014: elliespangler: 6 May 2014 :
GBIFID: 910496769; Occurrence Remarks: Found in traps at Zzyzx desert studies center.;; Coordinate Uncertainty in Meters: 231.00000.

GBIFID: 1580501889; Occurrence Remarks: Crossing Pinto Basin road. Was fairly indulgent of me (more so than his pal down the way). I saw a third sidewinder crossing the Cottonwood Springs Road about 9pm the following night about 2 miles into the park (no photo). All 3 have been similar size.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3079888545; Occurrence Remarks: Had been run over by a vehicle. Was still alive, moving upper body some, flicking tongue out. Organs and digestive tract exerted.;; Coordinate Uncertainty in Meters: 28902.00000.

GBIFID: 910497855; Occurrence Remarks: Found while driving in afton canyon ohv area. Was moving across the road using side winding locomotion .;; Coordinate Uncertainty in Meters: 72.00000.

GBIFID: 3079848883; Occurrence Remarks: Injured near cloaca but moving off of hwy.;; Coordinate Uncertainty in Meters: 1953.00000.

San Bernardino, California: 34.915076, -116.964608: : 4/7/2021: Lauren Hernandez: 7 Apr 2021 :
GBIFID: 3079693242; Occurrence Remarks: Found on the move in mild wind, 71┬░;; Coordinate Uncertainty in Meters: 900.00000.

GBIFID: 923916029; Occurrence Remarks: Only live snake of the night.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3097046919; Occurrence Remarks: Handled under permit;; Coordinate Uncertainty in Meters: 28734.00000.

GBIFID: 3044810993; Occurrence Remarks: Two Sidewinders. One in the distance was moving uphill toward closest sidewinder in frame.;; Coordinate Uncertainty in Meters: 31.00000.

GBIFID: 1586937716; Occurrence Remarks: Crotalus cerastes 12 Aug 2017 CA, SBE Co., Mojave National Preserve;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1586948735; Occurrence Remarks: It has similar coloring so some of the sidewinders Ive seen out here but I only confidently identified those based on their movement and this one is clearly (and sadly) static;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 923926738; Occurrence Remarks: On the way to the sandstone night lizard spot we found this sidewinder on the road, Nate vouchered but I took a pic as well.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 923926750; Occurrence Remarks: On way back to car Nate found this curled up under bush. 2nd winder of night. Nate vouchered for database but I took a few pics.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3097293040; Occurrence Remarks: 76F, both snakes 10m apart;; Coordinate Uncertainty in Meters: 28930.00000.

Riverside, California: 33.608727, -116.27375: : 5/3/2021: Sendy Hern├índez Orellana Barrows: 3 May 2021 :

GBIFID: 3301781045; Occurrence Remarks: 72F edge of road - Moved to adjacent habitat.;; Coordinate Uncertainty in Meters: 15.00000.

GBIFID: 3097284044; Occurrence Remarks: 76F, both snakes 10m apart;; Coordinate Uncertainty in Meters: 28930.00000.

GBIFID: 3097159866; Occurrence Remarks: Not the greatest photo, sorry;; Coordinate Uncertainty in Meters: 28902.00000.

San Bernardino, California: 34.891359, -115.722942: : 5/7/2011: Alyssa Semerdjian: 7 May 2011 :

GBIFID: 3343716588; Occurrence Remarks: Roadkilled;; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 3335125651; Occurrence Remarks: Roadkilled;; Coordinate Uncertainty in Meters: 28930.00000.

San Bernardino, California: 35.072043, -115.671101: : 5/6/2011: Alyssa Semerdjian: 6 May 2011 :

GBIFID: 1802733163; Occurrence Remarks: Found somewhere off of Kelbaker Road between interstates 15 and 40 in the Mojave National Preserve. Found on a night drive the previous night (5/20/16);; Coordinate Uncertainty in Meters: 10663.00000.

GBIFID: 3355757372; Occurrence Remarks: Ridiculously tiny little guy, about 5 or 6 inches.;; Coordinate Uncertainty in Meters: 23.00000.

GBIFID: 3383993315; Occurrence Remarks: Unfortunately, I found this right outside my door in the bush. I was really hoping it was a gopher snake or something nonpoisonous. But I couldnt ignore the rattle. I sent the photo to SnakeSnap app for identification. Once confirmed, I went on NextDoor to seek advice on what to do about the rattlesnake. Someone suggested calling the fire dept, and they referred me to Animal Control. Thankfully, Animal Control came out promptly and caught the snake and put it in a bucket. I didnt ask what they were going to do with the snake. If released, hopefully it was freed far far away.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3384163947; Occurrence Remarks: Looked cautiously for it, but could not find the beast.;; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.911633, -116.669595: : 8/17/2025: kalan714: 17 Aug 2025 ; Coordinate Uncertainty in Meters: 4.00000.

San Bernardino, California: 34.193824, -116.282973: : 7/3/2026: desertratttt: 3 Jul 2026 ; Coordinate Uncertainty in Meters: 48.00000.

San Bernardino, California: 34.193943, -116.282931: : 8/22/2025: desertratttt: 22 Aug 2025 ; Coordinate Uncertainty in Meters: 54.00000.

Riverside, California: 33.980175, -116.7981: : 7/5/2026: c_merrylees: 5 Jul 2026 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.451697, -116.114114: : 8/25/2025: worwaj: 25 Aug 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Riverside, California: 33.498451, -114.709: : 4/10/2026: Austin R. Kelly: 10 Apr 2026 ; Coordinate Uncertainty in Meters: 28957.00000.

Maricopa, Arizona: 33.788517, -112.990532: : 8/29/2025: James Hicks: 29 Aug 2025 ; Coordinate Uncertainty in Meters: 28930.00000.

Maricopa, Arizona: 33.983721, -112.881033: : 8/29/2025: James Hicks: 29 Aug 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.934042, -116.455027: : 8/25/2025: Jacob Skaggs: 25 Aug 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.809123, -116.596295: : 8/25/2025: Jacob Skaggs: 25 Aug 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.651266, -114.680391: : 9/4/2025: kyleemcf: 4 Sep 2025 ; Coordinate Uncertainty in Meters: 4175.00000.

San Diego, California: 33.248755, -116.295258: : 3/7/2026: Jimmy Kidd: 7 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Riverside, California: 33.906892, -116.650117: : 9/6/2025: tbargholz: 6 Sep 2025 ; Coordinate Uncertainty in Meters: 2.00000.

Riverside, California: 33.92828, -116.596437: : 9/4/2025: tbargholz: 4 Sep 2025 ; Coordinate Uncertainty in Meters: 2.00000.

Riverside, California: 33.901625, -116.602377: : 9/22/2025: Oonagh: 22 Sep 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

San Bernardino, California: 34.143867, -116.108811: : 8/22/2025: iancarnes29: 22 Aug 2025 ; Coordinate Uncertainty in Meters: 4.00000.

San Bernardino, California: 34.194079, -116.283113: : 7/12/2026: desertratttt: 12 Jul 2026 ; Coordinate Uncertainty in Meters: 25.00000.

San Diego, California: 33.259558, -116.376636: : 9/10/2025: Don Rideout: 10 Sep 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.802224, -116.626757: : 9/22/2025: Oonagh: 22 Sep 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.885168, -116.793808: : 9/22/2025: Oonagh: 22 Sep 2025 ; Coordinate Uncertainty in Meters: 28902.00000.

Riverside, California: 33.822857, -116.325503: : 2/7/2026: Cameron W Barrows: 7 Feb 2026 ; Coordinate Uncertainty in Meters: 8.00000.

Riverside, California: 33.911438, -116.669638: : 9/13/2025: Lucas Ramirez: 13 Sep 2025 ; Coordinate Uncertainty in Meters: 2.00000.

Maricopa, Arizona: 33.332578, -112.414597: : 9/8/2024: pseudalpine: 8 Sep 2024 ; Coordinate Uncertainty in Meters: 0.11000.

Riverside, California: 33.773097, -116.310363: : 6/17/2026: Melanie J. Davis: 17 Jun 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Riverside, California: 33.868678, -116.513458: : 6/11/2026: Melanie J. Davis: 11 Jun 2026 ; Coordinate Uncertainty in Meters: 4.00000.

Riverside, California: 33.904991, -116.643762: : 8/30/2025: tbargholz: 30 Aug 2025 ; Coordinate Uncertainty in Meters: 27.00000.

San Diego, California: 33.234812, -116.380435: : 9/4/2025: GnatureGoof: 4 Sep 2025 ; Coordinate Uncertainty in Meters: 393.00000.

San Bernardino, California: 34.895338, -115.704219: : 3/27/2026: Chris Mulligan: 27 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 35.549318, -117.414053: : 10/21/2025: meghan12337: 21 Oct 2025 ; Coordinate Uncertainty in Meters: 99.00000.

Clark, Nevada: 36.116565, -115.854298: : 9/21/2025: Courtney Christie: 21 Sep 2025 ; Coordinate Uncertainty in Meters: 28592.00000.

San Bernardino, California: 35.503575, -115.426238: : 7/20/2026: Desert Max: 20 Jul 2026 ; Coordinate Uncertainty in Meters: 4.00000.

Clark, Nevada: 36.433963, -115.376115: : 7/19/2026: Josh Davidson: 19 Jul 2026 ; Coordinate Uncertainty in Meters: 96.00000.

Kern, California: 35.736585, -117.84233: : 10/31/2025: Rachel Woodard: 31 Oct 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Kern, California: 35.289031, -118.160613: : 9/28/2024: herphendrie: 28 Sep 2024 ; Coordinate Uncertainty in Meters: 28706.00000.

Kern, California: 35.367752, -118.115421: : 9/28/2024: herphendrie: 28 Sep 2024 ; Coordinate Uncertainty in Meters: 28706.00000.

San Bernardino, California: 35.386613, -116.873766: : 9/6/2025: Erik Atwell: 6 Sep 2025 ; Coordinate Uncertainty in Meters: 28706.00000.

San Bernardino, California: 35.256437, -116.005692: : 9/26/2025: antman21: 26 Sep 2025 ; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4171883591; Occurrence Remarks: Date is approximate, slide labelled Apr/87;; Coordinate Uncertainty in Meters: 1352.00000.

GBIFID: 4162578667; Occurrence Remarks: DOR, dirt road;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4096676507; Occurrence Remarks: Two tracks running in opposite directions.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 1571057268; Occurrence Remarks: Unfortunate roadkill on the road to the crater.;; Coordinate Uncertainty in Meters: 1732.00000.

GBIFID: 4096735670; Occurrence Remarks: Rattling at me;; Coordinate Uncertainty in Meters: 372.00000.

Inyo, California: 37.413238, -118.449574: : 3/22/2026: Casey Fellhoelter: 22 Mar 2026 ; Coordinate Uncertainty in Meters: 20.00000.

Clark, Nevada: 36.46353, -115.484551: : 5/30/2026: Erik Johnson: 30 May 2026 ; Coordinate Uncertainty in Meters: 1.11000.

Kern, California: 35.361854, -117.986356: : 3/22/2026: Aaron Veale: 22 Mar 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Esmeralda, Nevada: 37.124111, -117.201937: : 3/17/2026: desert_hambone: 17 Mar 2026 ; Coordinate Uncertainty in Meters: 9.00000.

Nye, Nevada: 36.657225, -116.477289: : 3/22/2026: Jacob Saucier: 22 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: ?; Coordinate Uncertainty in Meters: 0.11000.

Clark, Nevada: 36.016031, -115.707353: : 4/21/2026: Alejandro: 21 Apr 2026 ; Coordinate Uncertainty in Meters: 4.00000.

Clark, Nevada: 36.00825, -115.663238: : 4/23/2026: Alejandro: 23 Apr 2026 ; Coordinate Uncertainty in Meters: 10.00000.

Occurrence Remarks: Mid-high 80ΓÇÖs at 5:38pm, windy, full moon rising during this time. Moved to a safer location as it was near buildings and the road. Good size and beautiful!; Coordinate Uncertainty in Meters: 28534.00000.

Esmeralda, Nevada: 37.043933, -117.23787: : 5/17/2026: James: 17 May 2026 ; Coordinate Uncertainty in Meters: 8.00000.

San Bernardino, California: 35.739675, -116.025474: : 5/21/2026: Max Goldman: 21 May 2026 ; Coordinate Uncertainty in Meters: 28649.00000.

San Bernardino, California: 35.469313, -117.565433: : 4/6/2026: gisel_15: 6 Apr 2026 ; Coordinate Uncertainty in Meters: 28677.00000.

Nye, Nevada: 36.443447, -116.3546: : 4/16/2026: dhorowski: 16 Apr 2026 ; Coordinate Uncertainty in Meters: 2.00000.

San Bernardino, California: 35.26075, -116.723363: : 5/30/2026: alaskalexi: 30 May 2026 ; Coordinate Uncertainty in Meters: 15.00000.

San Bernardino, California: 35.592175, -115.716825: : 5/15/2026: california_every_reptile: 15 May 2026 ; Coordinate Uncertainty in Meters: 28677.00000.

GBIFID: 1088933403; Occurrence Remarks: Mojave desert sidewinder in cruise mode, oblivious to my flashlight;; Coordinate Uncertainty in Meters: 5.00000.

Clark, Nevada: 36.80735, -114.94748: : 4/20/2026: Genyss Duncan: 20 Apr 2026 ; Coordinate Uncertainty in Meters: 6.00000.

Inyo, California: 36.702584, -118.191181: : 3/28/2026: california_every_reptile: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 28505.00000.

GBIFID: 4127363486; Occurrence Remarks: Substantial girth on this one.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 1880643849; Occurrence Remarks: Comparative photos, both with a tripod. First photo with camera flash. Second photo, fluorescing under 365 nanometer ultraviolet light with ZWB2 bandpass filter centered on 365 nm.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3923484674; Occurrence Remarks: Relocated to an area not so near the road.;; Coordinate Uncertainty in Meters: 215.00000.

Occurrence Remarks: Very clean set of tracks; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: Dead on road DOR; Coordinate Uncertainty in Meters: 2.00000.

Nye, Nevada: 36.696758, -116.654512: : 3/15/2026: Daniel McNair: 15 Mar 2026 ; Coordinate Uncertainty in Meters: 2.00000.

Occurrence Remarks: Sleeping under my tent! Found in the morning when I picked up my tent to shake it out. I have no idea how I didnΓÇÖt roll on it or lay on it while sleeping or packing everything upΓÇª; Coordinate Uncertainty in Meters: 3.00000.

Kern, California: 35.389145, -118.16235: : 5/24/2025: herphendrie: 24 May 2025 ; Coordinate Uncertainty in Meters: 28706.00000.

Kern, California: 35.265528, -118.199777: : 5/24/2025: herphendrie: 24 May 2025 ; Coordinate Uncertainty in Meters: 28706.00000.

Kern, California: 35.372875, -117.98837: : 3/24/2026: Teale Fristoe: 24 Mar 2026 ; Coordinate Uncertainty in Meters: 28706.00000.

Kern, California: 35.310478, -118.019705: : 3/26/2026: Larry Chen: 26 Mar 2026 ; Coordinate Uncertainty in Meters: 5.00000.

Lincoln, Nevada: 37.229283, -115.125808: : 5/12/2026: Corey Lange: 12 May 2026 ; Coordinate Uncertainty in Meters: 9.00000.

Kern, California: 35.554772, -117.653981: : 4/13/2026: madpsyentist710: 13 Apr 2026 ; Coordinate Uncertainty in Meters: 74.00000.

Kern, California: 35.31062, -118.019608: : 3/26/2026: Larry Chen: 26 Mar 2026 ; Coordinate Uncertainty in Meters: 42.00000.

GBIFID: 3923532024; Occurrence Remarks: Sandy flats near Ridgecrest, California.;; Coordinate Uncertainty in Meters: 28649.00000.

Nye, Nevada: 37.376938, -117.134285: : 5/6/2026: Harley Winfrey: 6 May 2026 ; Coordinate Uncertainty in Meters: 88.00000.

Washington, Utah: 37.223893, -113.996477: : 5/9/2026: jvrunst: 9 May 2026 ; Coordinate Uncertainty in Meters: 84.00000.

Inyo, California: 35.990029, -117.908793: : 5/2/2026: Lshoemaker: 2 May 2026 ; Coordinate Uncertainty in Meters: 72.00000.

Inyo, California: 35.991342, -117.903901: : 5/2/2026: Lshoemaker: 2 May 2026 ; Coordinate Uncertainty in Meters: 673.00000.

Clark, Nevada: 35.473169, -114.838161: : 3/28/2026: rnpreptiles: 28 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Washington, Utah: 37.039012, -113.924137: : 5/9/2025: gwardenray: 9 May 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Washington, Utah: 37.039075, -113.92413: : 5/10/2025: gwardenray: 10 May 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Nye, Nevada: 36.649563, -116.423882: : 4/30/2026: Harley Winfrey: 30 Apr 2026 ; Coordinate Uncertainty in Meters: 88.00000.

Inyo, California: 36.21565, -117.950912: : 5/11/2026: Ethan Gilmore: 11 May 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Kern, California: 35.339135, -118.030472: : 3/25/2026: Rande Gallant: 25 Mar 2026 ; Coordinate Uncertainty in Meters: 28706.00000.

San Bernardino, California: 35.324804, -116.814885: : 9/18/2025: texasbird_01: 18 Sep 2025 ; Coordinate Uncertainty in Meters: 28706.00000.

Occurrence Remarks: Juvenile, estimated total length of 4ΓÇ¥ if uncoiled.; Coordinate Uncertainty in Meters: 28677.00000.

Occurrence Remarks: I have a video of this moving sideways.; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 35.256438, -116.005714: : 9/26/2025: marleyjanssen: 26 Sep 2025 ; Coordinate Uncertainty in Meters: 8.00000.

San Bernardino, California: 35.256538, -116.005836: : 9/26/2025: marleyjanssen: 26 Sep 2025 ; Coordinate Uncertainty in Meters: 6.00000.

Mohave, Arizona: 36.940566, -113.904983: : 5/7/2026: Andrew Campos: 7 May 2026 ; Coordinate Uncertainty in Meters: 28476.00000.

Inyo, California: 35.966609, -116.044726: : 3/21/2026: Andrew Campos: 21 Mar 2026 ; Coordinate Uncertainty in Meters: 28620.00000.

Occurrence Remarks: Huge. By far the largest sidewinder tracks IΓÇÖve ever seen.; Coordinate Uncertainty in Meters: 28649.00000.

San Bernardino, California: 35.392009, -116.874839: : 5/16/2026: Erik Atwell: 16 May 2026 ; Coordinate Uncertainty in Meters: 28706.00000.

Occurrence Remarks: Alive on road AOR; Coordinate Uncertainty in Meters: 12.00000.

Occurrence Remarks: Dead on road DOR; Coordinate Uncertainty in Meters: 3.00000.

Occurrence Remarks: Alive on road AOR; Coordinate Uncertainty in Meters: 5.00000.

Occurrence Remarks: Tracks; Coordinate Uncertainty in Meters: 28649.00000.

Inyo, California: 36.607212, -117.117477: : 3/20/2026: bryceking: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Inyo, California: 36.032253, -117.249405: : 3/20/2026: bryceking: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Clark, Nevada: 36.482144, -115.625094: : 3/22/2026: rnpreptiles: 22 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: Note - more erratic than Mojave rattlesnake. Tracks lead to very small burrow opening.; Coordinate Uncertainty in Meters: 28649.00000.

Clark, Nevada: 35.975075, -115.251105: : 3/30/2026: Genyss Duncan: 30 Mar 2026 ; Coordinate Uncertainty in Meters: 17.00000.

Clark, Nevada: 36.583363, -114.409283: : 3/31/2026: Casey Flinspach: 31 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 35.237763, -117.063072: : 4/10/2026: texasbird_01: 10 Apr 2026 ; Coordinate Uncertainty in Meters: 74.00000.

San Bernardino, California: 35.229492, -116.992477: : 10/2/2025: Lee: 2 Oct 2025 ; Coordinate Uncertainty in Meters: 28706.00000.

San Bernardino, California: 35.397948, -117.103012: : 4/1/2026: Erik Atwell: 1 Apr 2026 ; Coordinate Uncertainty in Meters: 28706.00000.

Occurrence Remarks: Super dope snake to come across right after sunset. 92┬░ crossing the road! The Mojave is a helluva place. Only my second ΓÇÿwinder and first from CA Inyo County; Coordinate Uncertainty in Meters: 28592.00000.

Lincoln, Nevada: 37.127228, -115.187195: : 3/27/2026: Corey Lange: 27 Mar 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Occurrence Remarks: A Sidewinder was observed outside an office building in Mercury, Nevada. The sidewinder had caught the lizard before it was captured to be moved to a safer location.; Coordinate Uncertainty in Meters: 488.00000.

San Bernardino, California: 35.396705, -117.139945: : 4/6/2026: Erik Atwell: 6 Apr 2026 ; Coordinate Uncertainty in Meters: 28706.00000.

Inyo, California: 37.229149, -118.26517: : 6/5/2026: ghost_spoor: 5 Jun 2026 ; Coordinate Uncertainty in Meters: 28417.00000.

San Bernardino, California: 35.552333, -117.61692: : 6/10/2026: madpsyentist710: 10 Jun 2026 ; Coordinate Uncertainty in Meters: 52.00000.

Nye, Nevada: 36.567034, -116.122452: : 5/21/2025: Jacob Saucier: 21 May 2025 ; Coordinate Uncertainty in Meters: 8.00000.

Occurrence Remarks: I believe this is a Mojave Sidewinder!! I have a video of it perusing me, back to my vehicle. I found it on the other side of the road under a bush and it followed me instead of taking cover in the bushes!!!! I think that the video would be great for research if you would like to see it reach out to me!! I wish I would have got a picture; Coordinate Uncertainty in Meters: 300.00000.

Inyo, California: 36.460411, -117.392005: : 6/20/2026: lukescritters: 20 Jun 2026 ; Coordinate Uncertainty in Meters: 28534.00000.

Nye, Nevada: 36.68518, -116.498628: : 7/9/2026: lukescritters: 9 Jul 2026 ; Coordinate Uncertainty in Meters: 4.00000.

San Bernardino, California: 35.54619, -115.668042: : 6/28/2026: Jeremiah Degenhardt: 28 Jun 2026 ; Coordinate Uncertainty in Meters: 28677.00000.

Inyo, California: 36.672003, -118.128333: : 7/13/2026: Tyler nelsen: 13 Jul 2026 ; Coordinate Uncertainty in Meters: 2.00000.

San Bernardino, California: 35.488125, -115.723361: : 6/28/2026: Oonagh Degenhardt: 28 Jun 2026 ; Coordinate Uncertainty in Meters: 28677.00000.

San Bernardino, California: 35.478498, -115.714889: : 6/28/2026: Oonagh Degenhardt: 28 Jun 2026 ; Coordinate Uncertainty in Meters: 28677.00000.

Clark, Nevada: 36.336072, -115.281608: : 6/17/2026: Solomon Feinstein: 17 Jun 2026 ; Coordinate Uncertainty in Meters: 4.00000.

Clark, Nevada: 36.731292, -114.729661: : 9/24/2025: David Syzdek: 24 Sep 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Inyo, California: 35.801801, -117.908107: : 6/22/2026: sara schneider: 22 Jun 2026 ; Coordinate Uncertainty in Meters: 28620.00000.

Clark, Nevada: 36.734389, -114.740433: : 9/24/2025: David Syzdek: 24 Sep 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Inyo, California: 36.629853, -117.000234: : 4/18/2026: niravraham: 18 Apr 2026 ; Coordinate Uncertainty in Meters: 28505.00000.

Inyo, California: 36.799262, -117.190879: : 4/18/2026: niravraham: 18 Apr 2026 ; Coordinate Uncertainty in Meters: 28505.00000.

San Bernardino, California: 35.49287, -115.790436: : 6/28/2026: Jeremiah Degenhardt: 28 Jun 2026 ; Coordinate Uncertainty in Meters: 28677.00000.

Occurrence Remarks: Old; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 3747339624; Occurrence Remarks: First sidewinder of the season IΓÇÖve seen. Right on the road in front of my house. Unfortunately it looks like it might have been knicked by a vehicle or maybe a coyote or something. Two small blood spots on top of its neck and body. A friend moved it into the bushes with snake tongs and it appeared lively again, otherwise it had been resting on the same spot in the road for about 5-10 minutes moving very slowly. Approximately 78 degrees at 7:45pm and breezy. Sun just set around 7pm. Summer 2020 in Death Valley I saw somewhere around 30 sidewinders alive or roadkilledΓÇªSummer 2021 I didnΓÇÖt count the roadkilled ones but I saw way less sidewinders. Alive, maybe 3-4. Hopefully this summer I will see more sidewinders! Seeing one is March is a good signΓÇª;; Coordinate Uncertainty in Meters: 28534.00000.

San Bernardino, California: 35.66552, -117.60332: : 4/9/2022: Kolin Campbell: 9 Apr 2022 :
GBIFID: 3759738417; Occurrence Remarks: First one seen this year.;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 3759701423; Occurrence Remarks: 68 degrees at 8:23pm crossing the road;; Coordinate Uncertainty in Meters: 28476.00000.

GBIFID: 3759304435; Occurrence Remarks: Road victim.;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 3773416186; Occurrence Remarks: 91 degrees t 8:21pm. Sidewinder #3 IΓÇÖve seen (alive) this year (2022).;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3858394415; Occurrence Remarks: 83 degrees at 11:05pm;; Coordinate Uncertainty in Meters: 20.00000.

GBIFID: 3859593818; Occurrence Remarks: in grass near trail bench overlooking pond. Young snake. First spotted by @jrm671;; Coordinate Uncertainty in Meters: 15.00000.

GBIFID: 3764159675; Occurrence Remarks: 4/7/18. Resting under the salt creek walkway.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3873635911; Occurrence Remarks: 97-98 degrees at 9:44pm;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 3873335217; Occurrence Remarks: 89 degrees at 9:01pm. Saw it in a large parking lot, crossing the parking lot.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 3873121517; Occurrence Remarks: Found dead while hiking. Kinda looks like something barfed it up? Or maybe just the way it looks.;; Coordinate Uncertainty in Meters: 7.00000.

GBIFID: 3902806804; Occurrence Remarks: what a cutie;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1850939366; Occurrence Remarks: Stovepipe;; Coordinate Uncertainty in Meters: 1281.00000.

San Bernardino, California: 35.56058, -116.978548: : 6/3/2012: Christian Schwarz: 3 Jun 2012 :
GBIFID: 1668787615; Occurrence Remarks: Date might be off by one or two days.;; Coordinate Uncertainty in Meters: 29572.00000.

GBIFID: 1880476264; Occurrence Remarks: Was on The River Mountains Trail. I suspect it was run over by a bicycle. What kind of snake is it?;; Coordinate Uncertainty in Meters: 26.00000.

GBIFID: 3903149579; Occurrence Remarks: AOR sidewinder;; Coordinate Uncertainty in Meters: 254.00000.

GBIFID: 1088933400; Occurrence Remarks: Mojave desert sidewinder in cruise mode, oblivious to my flashlight;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1088936135; Occurrence Remarks: Sort of a half-satisfying first experience with this species. We found it basically dead on the road, and it wasnt until we moved it to the margin (with a stick) that it started moving. It could barely move, and clearly had some kind of internal injury, possibly inflicted by a predator (youd think a car would have flattened it).;; Coordinate Uncertainty in Meters: 356.00000.

GBIFID: 1880547987; Occurrence Remarks: Saw two. Incredible creature;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3923285242; Occurrence Remarks: Camila Shannon photo;; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 3892583713; Occurrence Remarks: DOR. DidnΓÇÖt see any injuries though, a bit odd. Moved off of road, no signs of life.;; Coordinate Uncertainty in Meters: 22.00000.

GBIFID: 3902733561; Occurrence Remarks: air temperature 97┬░ road temperature 92┬░ male;; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 3925113114; Occurrence Remarks: Small snake, but looks like it has one or two rattles, maybe?;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1088934495; Occurrence Remarks: Found on the road with what seemed to be some pretty bad internal injury, but there was only a little blood and a small part of the body was misshapen. After moving it off the road, it opened its mouth a few times and made some faint rattles. Made for great pictures, but it was rough seeing such an amazing animal dying.;; Coordinate Uncertainty in Meters: 1.11000.

San Bernardino, California: 35.300583, -115.222695: : 9/3/2014: Professor Brian Todd at UC Davis: 3 Sep 2014 :

San Bernardino, California: 35.463598, -115.369328: : 9/1/2014: Professor Brian Todd at UC Davis: 1 Sep 2014 :

GBIFID: 1088966133; Occurrence Remarks: Large adult, ca 80 deg F;; Coordinate Uncertainty in Meters: 200.00000.

GBIFID: 1088973366; Occurrence Remarks: Crotalus cerastes ssp cerastes, cruising/hunting;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1088973369; Occurrence Remarks: Crotalus cerastes ssp cerastes, hunting/cruising;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1088973351; Occurrence Remarks: Crotalus cerastes ssp cerastes, cruising/hunting;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1088973382; Occurrence Remarks: Crotalus cerastes ssp cerastes, about 9 and 14. No obvious interaction between them.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1088973381; Occurrence Remarks: Crotalus cerastes ssp cerastes, cruising/hunting;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4034932448; Occurrence Remarks: Roadkilled. 68 degrees at 9:17pm.;; Coordinate Uncertainty in Meters: 142.00000.

GBIFID: 1880574117; Occurrence Remarks: My first fully living sidewinder. We go to watch it sidewind and everything! We also noted that 80-85F seemed to be the sweet spot for temperature on this road.;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 1891308346; Occurrence Remarks: Small baby;; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 4080559260; Occurrence Remarks: Dead on road DOR;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 1880574183; Occurrence Remarks: Too amazing.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4102718949; Occurrence Remarks: Snake pancake! My foot was about six inches away when I looked down and saw it. No rattling until I had stepped back and taken a couple photos. It retreated into a collapsed tortoise burrow and I took some more pictures.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4102737950; Occurrence Remarks: Hiding at base of cat claw acacia. Had a spot that was in the sun (sun had just gone down);; Coordinate Uncertainty in Meters: 11.10000.

GBIFID: 4103155991; Occurrence Remarks: No, not a duplicate. There were two sidewinders under acacia trees ten feet apart!;; Coordinate Uncertainty in Meters: 11.10000.

GBIFID: 4034785947; Occurrence Remarks: Photo Credit: Rod Colvin/USFWS Volunteer;; Coordinate Uncertainty in Meters: 2.00000.

GBIFID: 4103247727; Occurrence Remarks: Sidewinder #3. This one was DOR though :/;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4102750716; Occurrence Remarks: Sidewinder #2;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4103269945; Occurrence Remarks: RX10_38636, RX10_38637. Tracks only.;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 4103332758; Occurrence Remarks: Sidewinder #1;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 4111760843; Occurrence Remarks: Special Use Permit #84554-22-002;; Coordinate Uncertainty in Meters: 7.00000.

GBIFID: 4091498244; Occurrence Remarks: Several sets of the same tracks seen today.;; Coordinate Uncertainty in Meters: 28649.00000.

San Bernardino, California: 35.466653, -115.27221: : 7/24/2018: Julien Tchilinguirian: 24 Jul 2018 :

GBIFID: 4103247981; Occurrence Remarks: I looked in this hole and saw 2 sidewinders (mating) at the front of the hole!!! My first time ever seeing this!!! It was so cool!!!! Saw them at 11:11am. It was 83 degrees when I started hiking at 8:30am and when I got back to the car at 12pm it was 86 degrees. IΓÇÖm guessing the female was on top of the male. The female was feisty and rattled at me. The male was so calm and chill and didnΓÇÖt care about me at all.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4121143013; Occurrence Remarks: First one seen this year. Temp was 80F with 30% humidity. Had a big thunderstorm here last night and the ground was quite damp in many places.;; Coordinate Uncertainty in Meters: 28649.00000.

San Bernardino, California: 35.648942, -115.820186: : 5/16/2023: Boaz Benaiah Solorio: 16 May 2023 :

GBIFID: 4126865987; Occurrence Remarks: Observed on the evening of 5/28/2023 as well. DidnΓÇÖt move far overnight.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 1098915854; Occurrence Remarks: Two sidewinders were lying motionless together in a clump. Took this photo from about 15 ft away. When approached, the upper individual immediately fled. The lower individual was reluctant to move when we attempted to chase it off the road.;; Coordinate Uncertainty in Meters: 1.00000.

GBIFID: 1098915863; Occurrence Remarks: This was the fifth consecutive evening I had seen what was probably the same sidewinder lying under the same bush. It has always been there in the late afternoons, never present after dark. This is hopefully an ongoing observation of a single individual.;; Coordinate Uncertainty in Meters: 1.00000.

GBIFID: 4129808218; Occurrence Remarks: Well camouflaged along a sandy trail. DidnΓÇÖt spot it until I was 5 feet away and rapidly approaching. It exploded out of the depression on the upper left side of the photo, where it was coiled in a circle, giving a quick warning rattle.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 4153850239; Occurrence Remarks: I saw this sidewinder sprawled outside of this hole on my wall through the desert.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4153572055; Occurrence Remarks: I saw this sidewinder alive & well crossing the road.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 1099971070; Occurrence Remarks: This was one of the target species for the trip and one that I had wanted to see for years. They are much more active in the spring, and despite several hikes in the dunes, they eluded me. We were fortunate enough to see this one under the pickleweed along Salt Creek.;; Coordinate Uncertainty in Meters: 76.00000.

GBIFID: 4154010269; Occurrence Remarks: 81-83 degrees at 8:45pm. Saw it crossing the road on my way home from hiking.;; Coordinate Uncertainty in Meters: 28534.00000.

GBIFID: 4162509674; Occurrence Remarks: On road;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4171547269; Occurrence Remarks: Really skinny but was moving fast. 97 degrees air temperature wise at 9:44pm;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4171561439; Occurrence Remarks: Found laying in a burrow. Not sure if it was dead or alive. It looked like it had some dust on it, but it didnΓÇÖt smell. DidnΓÇÖt move while I took the photos.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4417082160; Occurrence Remarks: 86 degrees at 7:19pm. Sunset was 6:41pm.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 1135355180; Occurrence Remarks: Sidewinder. Should be C. cerastes cerastes in our area, but the tail coloring is what I would expect for C. cerastes laterorepens.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4528322569; Occurrence Remarks: Dead on shoulder of road :( at about 2,500 - 3,000ft elevation. The warmest itΓÇÖs been at this elevation is probably 65 degrees during the day. First sidewinder of the year IΓÇÖve seen. Second snake of the year IΓÇÖve seen. The first was a Panamint Rattlesnake last weekend that was alive in the backcountry on a hike;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4535679161; Occurrence Remarks: 60 degrees and super windy at 7:16pm. So cool to see one when it was a little cooler out!!! We watched til we saw it make it safely across the road.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4596840062; Occurrence Remarks: Very small snake, see pic 2;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 4424692495; Occurrence Remarks: Low 80ΓÇÖd at 6:04pm. Heard it rattling while I walked by on a drainage and then saw it under the bush.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4606744881; Occurrence Remarks: 15 mph wind, overcast 16.5c;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4607651438; Occurrence Remarks: Under creosote;; Coordinate Uncertainty in Meters: 7.00000.

GBIFID: 4606871454; Occurrence Remarks: pretty sure its a sidewinder, also could be a rattle tho;; Coordinate Uncertainty in Meters: 56889.00000.

GBIFID: 4846978305; Occurrence Remarks: 78 degrees air temperature wise at 8:33pm;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4867823296; Occurrence Remarks: Very gentlemanly. Only rattled after I stopped and noticed s/he was there. This docile snake was going to let me pass without letting his presence be known.;; Coordinate Uncertainty in Meters: 28534.00000.

GBIFID: 4901383134; Occurrence Remarks: 75░ Fareinheight, 11:30 PM, found on road near mountains;; Coordinate Uncertainty in Meters: 28447.00000.

GBIFID: 4901398193; Occurrence Remarks: Dead but without visible damage. There does appear to be a boot print beneath it, possibly it was stepped on.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 4909337525; Occurrence Remarks: Sitting outside large hole. Sprinkled several times today, and 10 minutes prior to seeing this sidewinder.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 4908766641; Occurrence Remarks: Basking on road, still probably in the 80s. Iconic snake that IÆm absolutely thrilled to have found. My lifer and my first herp in Arizona Mohave County;; Coordinate Uncertainty in Meters: 28476.00000.

GBIFID: 2237524482; Occurrence Remarks: Sidewinder tracks in the sand. I couldnΓÇÖt find the actual snake though.;; Coordinate Uncertainty in Meters: 28505.00000.

GBIFID: 4910921698; Occurrence Remarks: Moved it off the road with my snake hook and it was super laid back. DidnΓÇÖt rattle or move erratically or anything. Super neat!;; Coordinate Uncertainty in Meters: 28505.00000.

GBIFID: 4923654091; Occurrence Remarks: I Found this sidewinder driving at night.;; Coordinate Uncertainty in Meters: 1976.00000.

GBIFID: 2237525699; Occurrence Remarks: Sidewinder tracks in the sand! I couldnΓÇÖt find the actual snake.;; Coordinate Uncertainty in Meters: 28505.00000.

GBIFID: 2397469075; Occurrence Remarks: DOR. RIP;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 4936727999; Occurrence Remarks: Alive on road.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 4923668982; Occurrence Remarks: Little sidewinder that I found crossing the road at night. Sidewinders were very abundant this time of year.;; Coordinate Uncertainty in Meters: 293.00000.

GBIFID: 4945611769; Occurrence Remarks: A number of young out right now;; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 4923944498; Occurrence Remarks: 96 degrees at 11:38pm. Rattle appears to be broken off and growing back(?). Colors on the snake appear to be not as vibrant and more of a faded/chalky/dull looking color. Pretty neat looking snake. Also saw the perseid showers tonight.;; Coordinate Uncertainty in Meters: 28592.00000.

GBIFID: 4936591670; Occurrence Remarks: Same as https://www.inaturalist.org/observations/237773006;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 4936335473; Occurrence Remarks: Same as https://www.inaturalist.org/observations/237773009;; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 35.40585, -115.796223: : 9/4/2024: Jeremiah Degenhardt: 4 Sep 2024 :

San Bernardino, California: 35.456901, -115.767035: : 9/4/2024: Jeremiah Degenhardt: 4 Sep 2024 :

San Bernardino, California: 35.513175, -115.625179: : 9/4/2024: Jeremiah Degenhardt: 4 Sep 2024 :

San Bernardino, California: 35.256413, -116.012328: : 9/27/2024: Robert Daniel Avila: 27 Sep 2024 :

GBIFID: 4952615862; Occurrence Remarks: Not sure if it was dead or alive. It didnΓÇÖt rattle or move. It stayed frozen with rattle pointing up. Had no visible injuries.;; Coordinate Uncertainty in Meters: 358.00000.

GBIFID: 2243004125; Occurrence Remarks: Tiny, about 4 inches long;; Coordinate Uncertainty in Meters: 227489.00000.

GBIFID: 4981920690; Occurrence Remarks: Baby;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 4982378526; Occurrence Remarks: From my archives.;; Coordinate Uncertainty in Meters: 119.00000.

GBIFID: 4974206048; Occurrence Remarks: Warming up on the side of the road. So calm.;; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 5104705480; Occurrence Remarks: S120_45609. Road kill.;; Coordinate Uncertainty in Meters: 3.00000.

San Bernardino, California: 35.375931, -115.365891: : 3/25/2025: Alexander Gregory Mason: 25 Mar 2025 :

GBIFID: 5133236326; Occurrence Remarks: tilt_angle_deg= -44.7 / roll_angle_deg=-2.5;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 5087824865; Occurrence Remarks: Reference: Rattlesnakes of the United States & Canada pg 110. By Manny Rubio;; Coordinate Uncertainty in Meters: 1572.00000.

GBIFID: 5133327109; Occurrence Remarks: 1st photo by Dylan Sandoval.;; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 1253307117; Occurrence Remarks: Crotalus cerastes cerastes. We were a bit surprised to see this snake out and about with the temperature at 55F. However, it had been a warm day;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 5134204634; Occurrence Remarks: This one dodged a big Semi! Luckily found it on time!;; Coordinate Uncertainty in Meters: 295.00000.

GBIFID: 2269311956; Occurrence Remarks: Dead on road;; Coordinate Uncertainty in Meters: 28534.00000.

GBIFID: 5154244599; Occurrence Remarks: One of the smallest IΓÇÖve ever seen. It zipped into a hole before I could take a better photo. In photo two you can make out (barely) the reddish button of the rattle.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 5153244434; Occurrence Remarks: During a rainstorm, fanning out its body, bowing its head, dare I say itΓÇÖs drinking the rain by its scales?;; Coordinate Uncertainty in Meters: 55.00000.

San Bernardino, California: 35.315604, -116.851773: : 5/3/2025: Alexander Gregory Mason: 3 May 2025 :

San Bernardino, California: 35.252533, -116.0402: : 5/1/2025: Jeremiah Degenhardt: 1 May 2025 :

San Bernardino, California: 35.272561, -115.975868: : 5/2/2025: Jeremiah Degenhardt: 2 May 2025 :

San Bernardino, California: 35.608631, -116.361433: : 5/7/2025: bighornsheepgirl: 7 May 2025 :
GBIFID: 5153556339; Occurrence Remarks: 84 degrees at 8:31pm;; Coordinate Uncertainty in Meters: 28649.00000.

San Bernardino, California: 35.679732, -115.667279: : 4/29/2025: Jeremiah Degenhardt: 29 Apr 2025 :

GBIFID: 5153416888; Occurrence Remarks: 76 degrees at 8:29pm;; Coordinate Uncertainty in Meters: 28620.00000.

GBIFID: 5167419031; Occurrence Remarks: Found in hole earlier in the day then later in the evening after eating.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 1262385858; Occurrence Remarks: Seen at the Mesquite Dunes;; Coordinate Uncertainty in Meters: 853.00000.

GBIFID: 5168184021; Occurrence Remarks: Found on the road.;; Coordinate Uncertainty in Meters: 28706.00000.

San Bernardino, California: 35.29169, -116.882543: : 5/11/2025: Alexander Gregory Mason: 11 May 2025 :

GBIFID: 5153045087; Occurrence Remarks: Tracks observed in sand near brush and likely rodent tracks.;; Coordinate Uncertainty in Meters: 0.11000.

San Bernardino, California: 35.30307, -116.845921: : 5/25/2025: Alexander Gregory Mason: 25 May 2025 :

GBIFID: 5199037040; Occurrence Remarks: Juvenile found while following the tracks of a larger one;; Coordinate Uncertainty in Meters: 28447.00000.

GBIFID: 5188435942; Occurrence Remarks: Found dead on the road;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 5198682052; Occurrence Remarks: Bad pic but rattled at me and had typical sidewinder horns;; Coordinate Uncertainty in Meters: 166.00000.

GBIFID: 1640029659; Occurrence Remarks: a species of rattlesnake;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 5206244928; Occurrence Remarks: Sidewinder;; Coordinate Uncertainty in Meters: 366.00000.

GBIFID: 1269567627; Occurrence Remarks: These two sidewinders were not mating, and appeared merely to be lying in a pile. The much larger sidewinder appeared to be gravid.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 1272092685; Occurrence Remarks: 9:45 PM. 82F;; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 2579325048; Occurrence Remarks: 68-69 degrees out, 6:56pm, 5 miles north of Shoshone, alive on the road;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2596178627; Occurrence Remarks: She was gravid, ready to pop!;; Coordinate Uncertainty in Meters: 28447.00000.

GBIFID: 1273850118; Occurrence Remarks: Didnt see a single snake on our 10 day trip. These tracks are the best I did! Looked like the sidewinder tracks shown in the visitors center.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1323033093; Occurrence Remarks: Sidewinder Mojave (California);; Coordinate Uncertainty in Meters: 650.00000.

GBIFID: 2611273284; Occurrence Remarks: 89 degrees at 9:12am, crossed the road safely;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2611186393; Occurrence Remarks: dor :(;; Coordinate Uncertainty in Meters: 28677.00000.

GBIFID: 2611271594; Occurrence Remarks: dor :(;; Coordinate Uncertainty in Meters: 28677.00000.

GBIFID: 1453209204; Occurrence Remarks: A newborn sidewinder found road cruising.;; Coordinate Uncertainty in Meters: 11007.00000.

GBIFID: 2620184458; Occurrence Remarks: Baby, very small. Look at pic compared to the double yellow line. 77 degrees at 8:30pm.;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 2626360263; Occurrence Remarks: Caught ΓÇ£en flagrante delictoΓÇ¥. Well, it is springtime.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2626212152; Occurrence Remarks: Found dead, apparently crushed by a car.;; Coordinate Uncertainty in Meters: 215.00000.

GBIFID: 2626225914; Occurrence Remarks: Covered by sand in his ambush pit.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2620072641; Occurrence Remarks: 80 degrees at 8:30am. I had gotten in the car, drove about 20 minutes, parked, walked out of the vehicle, came back 3 minutes later and saw the sidewinder under the vehicle by the driver door. I donΓÇÖt know if it had been in the engine compartment and then slithered out when I parked, or what. But usually I am good at seeing a snake in the road or in the dirt. Who knows, it camouflages well. I could have parked over it or it could have been over to the side and I didnΓÇÖt even know. When I left, the snake was fine, never ran it over or anything, so thatΓÇÖs good :);; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2626584263; Occurrence Remarks: Juvenile;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2626493920; Occurrence Remarks: Juvenile;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2626414920; Occurrence Remarks: Nearing the end of an evening walk on an unusually cool, windy day, I had only seen a few hardy side-blotched lizards. It was surprise when I nearly stepped on this sidewinder!;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2626428100; Occurrence Remarks: This sidewinder does not appear to have moved from the spot where I saw it yesterday.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2626548940; Occurrence Remarks: Dead on road DOR;; Coordinate Uncertainty in Meters: 7.00000.

GBIFID: 2633987093; Occurrence Remarks: This is the highest point that IΓÇÖve ever observed a sidewinder on this hill.;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2634559411; Occurrence Remarks: Spotted in the middle of the road. Kept overnight for daylight photos & released early in the morning away from the road.;; Coordinate Uncertainty in Meters: 107.00000.

GBIFID: 2634301851; Occurrence Remarks: This snake was seen at nearly the same location the day prior.;; Coordinate Uncertainty in Meters: 2.00000.

GBIFID: 2641415732; Occurrence Remarks: Moving across road.;; Coordinate Uncertainty in Meters: 28534.00000.

GBIFID: 2813912243; Occurrence Remarks: Warning to naturalists. IΓÇÖve been observing snakes for years & due to complacency on my part, I was bitten on the thumb today by this snake.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 2818745847; Occurrence Remarks: We are in the midst of a heat wave so seeing this sidewinder out was unexpected.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 2818499946; Occurrence Remarks: Road carnage. Sad to see, this one was quite large (as sidewinders go).;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2818580984; Occurrence Remarks: Well hidden among what appeared to be a small rodent colony. I actually was able to follow its tracks to locate it.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 2818740084; Occurrence Remarks: 102 degrees at 8:53pm. Saw one after this, about 10 minutes later, https://www.inaturalist.org/observations/52909501;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2818743059; Occurrence Remarks: 100 degrees at 9:02pm. Saw another one about 10 minutes earlier down the road, https://www.inaturalist.org/observations/52909475;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2826420838; Occurrence Remarks: 91 degrees at 8:45am. It was basking in the road, I shooshed it off to the side. The photo appears the snake has recently ate, but I think the shadow makes it appear that way and the snake was slightly curved right in that area, because the following photos there isnΓÇÖt a bulge in its stomach but who knows. Really cool to see it stretched out!!;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2826289341; Occurrence Remarks: 99 degrees at 9:18pm. After I saw it and left, I drove by again 8 minutes later and it was in the same exact position. Maybe keeping still for a mouse to run by?;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2823289344; Occurrence Remarks: Would have missed this one had I not stopped to get a rock out of my shoe. Leaned on a rock for balance, on the opposite side was this sidewinder in its ambush position. I was surprised it hadnt already gone for deep shelter, the temperature was already high.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 1024328682; Occurrence Remarks: Numerous track patterns of this rattlesnake over the sand dunes in the morning. Unfortunately (or fortunately?), I couldnt find the actual animal.;; Coordinate Uncertainty in Meters: 127590.00000.

GBIFID: 1457636968; Occurrence Remarks: DOR. :(;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2856770250; Occurrence Remarks: One of 5 baby sidewinders I found;; Coordinate Uncertainty in Meters: 28534.00000.

GBIFID: 2856849432; Occurrence Remarks: DOR. Fun to study this guy up close, but sad to see him this way.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2860163881; Occurrence Remarks: High 80ΓÇÖs, maybe 90 degrees at 8:17pm. Sidewinder was alive and really flat! (Soaking up the heat from the asphalt?) I drove by this area again about 30 minutes later and it was gone.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2851104399; Occurrence Remarks: 92 degrees at 8:54am. Elevation here is about 2,000 feet. Just recording because sometimes itΓÇÖs hard to see and come across wildlife here (I did not run it over);; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2862297015; Occurrence Remarks: DOR, lowest elevation IΓÇÖve seen one this summer;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2862523009; Occurrence Remarks: DOR. Does it look like it was pregnant to you? How the end of the tail is wide and then it becomes narrow. Or is that an indication of gender?;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 2862297014; Occurrence Remarks: Second little baby I saw this night.;; Coordinate Uncertainty in Meters: 1.11000.

GBIFID: 2862490989; Occurrence Remarks: Tiny little baby. WouldnΓÇÖt be surprised if it was born this summer;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1586091885; Occurrence Remarks: Sidewinder found at the bottom of a fire reservoir. Probably killed by a bird and dropped or flung into the water.;; Coordinate Uncertainty in Meters: 28534.00000.

GBIFID: 2864886887; Occurrence Remarks: Baby # 2 this night.;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 2868083799; Occurrence Remarks: Dead on road, adult. I drove up this road beginning at about 6:45pm and it was not there, so it got ran over between 6:45pm - 8:51pm. There was another road killed adult less than a mile back on the road. Was bummed to see 3 road killed sidewinderΓÇÖs tonight and no others actively crossing the road. Lots of vehicle traffic on this Saturday night, folks going to Dantes View to see the sunset and stars (the smoke from the wildfires was just about gone this evening. It keeps coming in and out of the valley.);; Coordinate Uncertainty in Meters: 3.00000.

GBIFID: 2868315249; Occurrence Remarks: 81 degrees at 7:35pm, 4,000 feet elevation;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2868397713; Occurrence Remarks: Baby/neonate. 86 degrees at 9:29pm, 2,500 feet ish elevation. I kinda edited the colors on the 2nd picture of it coiled up to make the colors more bright. The first picture of it coiled up is with a flashlight and my camera light going off. They are so cute. WomenΓÇÖs 8.5 size shoe.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 2873810656; Occurrence Remarks: Crossing road.;; Coordinate Uncertainty in Meters: 28677.00000.

GBIFID: 2868289052; Occurrence Remarks: Dead on road, baby, 6 ish inches long. I drove up this road beginning at about 6:45pm and it was not there, so it got ran over between 6:45pm - 8:12pm. It was 76 degrees at 8:12pm, cooling down quickly. The last few times IΓÇÖve been on this road itΓÇÖs usually 90 degrees right here. Lots of vehicle traffic on this Saturday night, folks going to Dantes View to see the sunset and stars (the smoke from the wildfires was just about gone this evening. It keeps coming in and out of the valley.);; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2874020384; Occurrence Remarks: 96 degrees at 8:28pm, dead on road. Looked like it has been there a while, blood was dried looking dark maroon red. Sunset was around 6:30pm, so it must have been out between 6:30pm and 8:30pm. If it was hit a few hours prior, it would have been hotter than 96 degrees out. If it was before 6:30pm, the sun would have been out. 1 mile east of the Inn.;; Coordinate Uncertainty in Meters: 8.00000.

GBIFID: 2864801269; Occurrence Remarks: Baby;; Coordinate Uncertainty in Meters: 21.00000.

GBIFID: 2868139015; Occurrence Remarks: Dead on road, adult. WomenΓÇÖs size 9 running shoe for comparison...I drove up this road beginning at about 6:45pm and it was not there, so it got ran over between 6:45pm - 8:49. 82 degrees at 8:49pm. Lots of vehicle traffic on this Saturday night, folks going to Dantes View to see the sunset and stars (the smoke from the wildfires was just about gone this evening. It keeps coming in and out of the valley.);; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 2874042422; Occurrence Remarks: 82 degrees at 7:16pm. 3,000 feet elevation give or take. Dark out, but full moon, not too high in the sky at this time.;; Coordinate Uncertainty in Meters: 6.00000.

GBIFID: 2873760012; Occurrence Remarks: This snake was observed moving up along a dry, sandy wash fairly early in the morning, and then up to the dirt road, moving always in a sidewinding fashion. The snakes primary color matched the sand (pinkish). Elev. approx. 2,825 ft.;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 2873820382; Occurrence Remarks: 85 degrees at 10:02pm. Almost a full moon...pretty light out, could see the hillsΓÇÖ outlines.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 2873896319; Occurrence Remarks: 80 degrees at 8:57pm.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 2898247079; Occurrence Remarks: 82 degrees at 7:11pm. I was just about to get my hiking stick to gently soosh it off the road and it began moving off the road on its own, thank goodness. (This is a heavily trafficked road.) Then it went under a little overhang and began rattling at me.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2901608980; Occurrence Remarks: 75 degrees at 7:19pm crossing the road. It had no visible injuries but was extremely lethargic. I grabbed my hiking stick and moved it off the road, it didnΓÇÖt even care. DidnΓÇÖt even move itself. It looks like thereΓÇÖs a slight bulge in its stomach. A friend told me if could have just ate and this is why it could be acting that way. Any other information would be appreciated;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 2963948657; Occurrence Remarks: 76 degrees at 7:13pm. Suppose to cool down a lot starting this Sunday. Probably the last time to see snakes as frequent as I have been. ItΓÇÖs been a great summer looking for snakes. Looking forward to herping again in the spring.;; Coordinate Uncertainty in Meters: 4.00000.

GBIFID: 2882957255; Occurrence Remarks: DOR. 75 degrees at 9:21pm and just over 4,000 feet elevation.;; Coordinate Uncertainty in Meters: 229.00000.

GBIFID: 2988684745; Occurrence Remarks: Until today, I had never seen a rattlesnake this late in the year in the Western Mojave Desert. The temperature was about 70 degrees F when I saw this little baby. It was only 7-8 inches long.;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 899977874; Occurrence Remarks: only sidewinder of night, alive on road, got a pic before moving off road.;; Coordinate Uncertainty in Meters: 11.10000.

GBIFID: 911504558; Occurrence Remarks: Mojave Desert Sidewinder;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 911504529; Occurrence Remarks: Mojave Desert Sidewinder - defensive;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 911504512; Occurrence Remarks: Mojave Desert Sidewinder - defensive;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 911504477; Occurrence Remarks: Mojave Desert Sidewinder - frontal detail on head;; Coordinate Uncertainty in Meters: 5.00000.

GBIFID: 3090769529; Occurrence Remarks: First alive sidewinder (juvenile) IΓÇÖve seen this year of 2021. The air temperature was 68 degrees at 10:15pm.;; Coordinate Uncertainty in Meters: 847.00000.

GBIFID: 3112377876; Occurrence Remarks: 84 degrees at 8:09pm.;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 1024184840; Occurrence Remarks: We found this Sidewinder on the dirt cut, of a paved road.;; Coordinate Uncertainty in Meters: 10.00000.

GBIFID: 3112886529; Occurrence Remarks: First one IΓÇÖve seen this year. Held for photos & released this afternoon.;; Coordinate Uncertainty in Meters: 28649.00000.

GBIFID: 3118437596; Occurrence Remarks: loc approx;; Coordinate Uncertainty in Meters: 28534.00000.

GBIFID: 3112754360; Occurrence Remarks: This one had really dark dots on the top, it was really pretty.;; Coordinate Uncertainty in Meters: 57.00000.

GBIFID: 923926017; Occurrence Remarks: Sidewinder in ambush mode well after dark. First time in my experience to see one NOT cruising that late.;; Coordinate Uncertainty in Meters: 1.00000.

Kern, California: 35.232431, -118.05375: : 3/20/2026: herphendrie: 20 Mar 2026 ; Coordinate Uncertainty in Meters: 28706.00000.

GBIFID: 3333458379; Occurrence Remarks: 94 degrees at 9:24pm and yesterday there was rain in this area....Last summer I saw so many baby sidewinders while driving around, this summer I havenΓÇÖt seen any except this is the first one. Last spring was pretty wet, then the summer saw zero monsoons. But lots of baby sidewinders. Now this spring 2021 was very dry, but DV has had a couple monsoons the last few weeks. Rattlesnakes give birth in the last summer right? Maybe I was just seeing the babies later in the summer. Hope to keep seeing them!;; Coordinate Uncertainty in Meters: 28563.00000.

GBIFID: 1677296294; Occurrence Remarks: Two sidewinders mating, multiple photos.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 1671721049; Occurrence Remarks: Disturbed this YoY sidewinder when I knelt down to photograph an ant. It gave me the business but it lacked a rattle, so Im happy it decided to back away and not bite. Sadly, the result is no in-focus headshots. Note to self: sidewinder tracks may indicate presence of a nearby sidewinder.;; Coordinate Uncertainty in Meters: 0.11000.

GBIFID: 3712474412; Occurrence Remarks: Taken from a video. In the video snake moves sideways similar to this species.;; Coordinate Uncertainty in Meters: 140.00000.

GBIFID: 3384535431; Occurrence Remarks: Likely hatched this year as it was pretty small. CouldnÆt tell the sex.;; Coordinate Uncertainty in Meters: 28447.00000.

Clark, Nevada: 35.825082, -115.28318: : 8/21/2025: kariswildlife: 21 Aug 2025 ; Coordinate Uncertainty in Meters: 408.00000.

GBIFID: 1805390541; Occurrence Remarks: Horns above eyes make me wonder if this is a sidewinder. Found in more of a canyon than sandy area though.;; Coordinate Uncertainty in Meters: 1000.00000.

Washington, Utah: 37.002295, -113.613932: : 8/28/2025: Chris Frauenhofer: 28 Aug 2025 ; Coordinate Uncertainty in Meters: 28447.00000.

Washington, Utah: 37.071863, -113.413562: : 8/29/2025: Chris Frauenhofer: 29 Aug 2025 ; Coordinate Uncertainty in Meters: 28447.00000.

Nye, Nevada: 37.049862, -116.861425: : 7/7/2026: lukescritters: 7 Jul 2026 ; Coordinate Uncertainty in Meters: 28447.00000.

Nye, Nevada: 36.400243, -116.272875: : 8/26/2025: Jeremiah Degenhardt: 26 Aug 2025 ; Coordinate Uncertainty in Meters: 0.11000.

Occurrence Remarks: Hatchling, no more than 6in; Coordinate Uncertainty in Meters: 28706.00000.

Kern, California: 35.372905, -117.990945: : 7/15/2026: Max Breshears: 15 Jul 2026 ; Coordinate Uncertainty in Meters: 3.00000.

Occurrence Remarks: First one IΓÇÖve seen on the Utah side. PS this snake was NOT photogenic in the slightest; Coordinate Uncertainty in Meters: 28447.00000.

Clark, Nevada: 35.923905, -115.135833: : 7/17/2026: David Syzdek: 17 Jul 2026 ; Coordinate Uncertainty in Meters: 220.00000.

San Bernardino, California: 35.572812, -115.461013: : 7/18/2026: Desert Max: 18 Jul 2026 ; Coordinate Uncertainty in Meters: 5.00000.

Mohave, Arizona: 36.999255, -113.486542: : 8/12/2025: Mike Schijf: 12 Aug 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Nye, Nevada: 37.1385, -116.941093: : 7/9/2026: lukescritters: 9 Jul 2026 ; Coordinate Uncertainty in Meters: 28447.00000.

Clark, Nevada: 35.733895, -115.329362: : 9/25/2025: mwdmccloy: 25 Sep 2025 ; Coordinate Uncertainty in Meters: 3.00000.

Inyo, California: 36.591753, -116.996064: : 3/15/2026: Kyle Brine: 15 Mar 2026 ; Coordinate Uncertainty in Meters: 0.11000.