Reptiles & Amphibians of Big Bend National Park
The reptiles & amphibians most often spotted in Big Bend, ranked by recent research-grade observations.
Most-observed reptiles & amphibians in Big Bend
Greater Earless Lizard
Cophosaurus texanus
912 observations
Western Diamond-backed Rattlesnake
Crotalus atrox
449 observations
Rusty-rumped Whiptail
Aspidoscelis scalaris
339 observations · iNaturalist
Canyon Lizard
Sceloporus merriami
316 observations · iNaturalist
Marbled Whiptail
Aspidoscelis marmoratus
262 observations · iNaturalist
Common Side-blotched Lizard
Uta stansburiana
253 observations
Eastern Black-tailed Rattlesnake
Crotalus ornatus
218 observations · iNaturalist
Big Bend Slider
Trachemys gaigeae
213 observations
Red-spotted Toad
Anaxyrus punctatus
209 observations
Crevice Spiny Lizard
Sceloporus poinsettii
194 observations · iNaturalist
Texas Alligator Lizard
Gerrhonotus infernalis
177 observations
Trans-pecos Ratsnake
Bogertophis subocularis
174 observations
Southwestern Fence Lizard
Sceloporus cowlesi
159 observations · iNaturalist
Chihuahuan Nightsnake
Hypsiglena jani
147 observations · iNaturalist
Spiny Softshell
Apalone spinifera
137 observations
Common Checkered Whiptail
Aspidoscelis tesselatus
136 observations · iNaturalist
Texas Banded Gecko
Coleonyx brevis
112 observations · iNaturalist
Long-nosed Snake
Rhinocheilus lecontei
110 observations
Ornate Tree Lizard
Urosaurus ornatus
107 observations
Gopher Snake
Pituophis catenifer
100 observations
Rio Grande Leopard Frog
Lithobates berlandieri
97 observations · iNaturalist
Eastern Collared Lizard
Crotaphytus collaris
96 observations
Common Coachwhip
Masticophis flagellum
87 observations
Mediterranean House Gecko
Hemidactylus turcicus
76 observations
Twin-spotted Spiny Lizard
Sceloporus bimaculosus
73 observations · iNaturalist
Couch's Spadefoot
Scaphiopus couchii
67 observations · iNaturalist
Texas Toad
Anaxyrus speciosus
67 observations · iNaturalist
Black-necked Garter Snake
Thamnophis cyrtopsis
65 observations
Roundtail Horned Lizard
Phrynosoma modestum
57 observations · iNaturalist
Baird's Ratsnake
Pantherophis bairdi
55 observations · iNaturalist
Plain-bellied Watersnake
Nerodia erythrogaster
52 observations
Green Anole
Anolis carolinensis
51 observations
Big Bend Patch-nosed Snake
Salvadora deserticola
48 observations · iNaturalist
Great Plains Ground Snake
Sonora episcopa
45 observations · iNaturalist
Canyon Tree Frog
Dryophytes arenicolor
44 observations · iNaturalist
Striped Whipsnake
Masticophis taeniatus
38 observations
Mojave Rattlesnake
Crotalus scutulatus
38 observations
Chihuahuan Spotted Whiptail
Aspidoscelis exsanguis
37 observations · iNaturalist
Glossy Snake
Arizona elegans
34 observations
American Bullfrog
Lithobates catesbeianus
30 observations
Mountain Patch-nosed Snake
Salvadora grahamiae
28 observations · iNaturalist
Texas Lyre Snake
Trimorphodon vilkinsonii
28 observations · iNaturalist
Rock Rattlesnake
Crotalus lepidus
26 observations
Pond Slider
Trachemys scripta
25 observations
Green Treefrog
Dryophytes cinereus
24 observations · iNaturalist
Great Plains Skink
Plestiodon obsoletus
23 observations
Checkered Garter Snake
Thamnophis marcianus
22 observations · iNaturalist
Little Striped Whiptail
Aspidoscelis inornatus
22 observations · iNaturalist
Reticulated Gecko
Coleonyx reticulatus
21 observations · iNaturalist
Southwestern Blackhead Snake
Tantilla hobartsmithi
20 observations · iNaturalist