Reptiles & Amphibians of Illinois
The reptiles & amphibians most often spotted in Illinois, ranked by recent research-grade observations.
93,630
recent observations
50
species listed
50
reptiles & amphibians
Naturalists have logged 93,630 research-grade observations across the 50 most-recorded species in Illinois. The most frequently seen is the American Toad, with 8,433 recorded sightings.
Most-observed reptiles & amphibians in Illinois
American Toad
Anaxyrus americanus
8,433 observations
Pond Slider
Trachemys scripta
5,851 observations
Painted Turtle
Chrysemys picta
5,610 observations
American Bullfrog
Lithobates catesbeianus
5,509 observations
Common Garter Snake
Thamnophis sirtalis
5,241 observations
Common Watersnake
Nerodia sipedon
4,244 observations
DeKay's Brownsnake
Storeria dekayi
4,205 observations
Blanchard's Cricket Frog
Acris blanchardi
4,114 observations · iNaturalist
Common Snapping Turtle
Chelydra serpentina
3,792 observations
Green Frog
Lithobates clamitans
3,190 observations
Three-toed Box Turtle
Terrapene triunguis
3,183 observations · iNaturalist
Common Box Turtle
Terrapene carolina
2,846 observations
Northern Cottonmouth
Agkistrodon piscivorus
2,799 observations
Plains Garter Snake
Thamnophis radix
2,328 observations
Fowler's Toad
Anaxyrus fowleri
2,029 observations
Northern Leopard Frog
Lithobates pipiens
1,978 observations
Southern Leopard Frog
Lithobates sphenocephalus
1,875 observations
Central Ratsnake
Pantherophis alleghaniensis
1,595 observations
North American Racer
Coluber constrictor
1,213 observations
Prairie Lizard
Sceloporus consobrinus
1,175 observations · iNaturalist
Spring Peeper
Pseudacris crucifer
1,152 observations
Eastern Newt
Notophthalmus viridescens
1,102 observations
Boreal Chorus Frog
Pseudacris maculata
1,101 observations
Western Ratsnake
Pantherophis obsoletus
1,096 observations
Spiny Softshell
Apalone spinifera
1,091 observations
Eastern Foxsnake
Pantherophis vulpinus
1,066 observations · iNaturalist
Ring-necked Snake
Diadophis punctatus
1,058 observations
Plain-bellied Watersnake
Nerodia erythrogaster
960 observations
Common Five-lined Skink
Plestiodon fasciatus
905 observations
Spotted Salamander
Ambystoma maculatum
895 observations
Cave Salamander
Eurycea lucifuga
825 observations
Green Treefrog
Dryophytes cinereus
794 observations · iNaturalist
Gray Treefrog
Dryophytes versicolor
781 observations · iNaturalist
Small-mouthed Salamander
Ambystoma texanum
757 observations · iNaturalist
Eastern Copperhead
Agkistrodon contortrix
757 observations
Eastern Milksnake
Lampropeltis triangulum
753 observations
Rough Greensnake
Opheodrys aestivus
747 observations
Blue-spotted Salamander
Ambystoma laterale
697 observations
Northern Slimy Salamander
Plethodon glutinosus
629 observations
Eastern Fence Lizard
Sceloporus undulatus
589 observations
Broad-headed Skink
Plestiodon laticeps
558 observations
Red-bellied Snake
Storeria occipitomaculata
522 observations · iNaturalist
Marbled Salamander
Ambystoma opacum
492 observations
Little Brown Skink
Scincella lateralis
465 observations
Eastern Red-backed Salamander
Plethodon cinereus
457 observations
Western Ribbon Snake
Thamnophis proximus
450 observations
Prairie Kingsnake
Lampropeltis calligaster
446 observations · iNaturalist
Northern Map Turtle
Graptemys geographica
429 observations
Timber Rattlesnake
Crotalus horridus
427 observations
Western Slimy Salamander
Plethodon albagula
419 observations · iNaturalist
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