Reptiles & Amphibians of Illinois
The reptiles & amphibians most often spotted in Illinois, ranked by recent research-grade observations.
Most-observed reptiles & amphibians in Illinois
American Toad
Anaxyrus americanus
8,072 observations
Pond Slider
Trachemys scripta
5,642 observations
Painted Turtle
Chrysemys picta
5,324 observations
American Bullfrog
Lithobates catesbeianus
5,301 observations
Common Garter Snake
Thamnophis sirtalis
5,128 observations
Common Watersnake
Nerodia sipedon
4,098 observations
DeKay's Brownsnake
Storeria dekayi
4,077 observations
Blanchard's Cricket Frog
Acris blanchardi
4,003 observations · iNaturalist
Common Snapping Turtle
Chelydra serpentina
3,614 observations
Three-toed Box Turtle
Terrapene triunguis
3,077 observations · iNaturalist
Green Frog
Lithobates clamitans
3,033 observations
Northern Cottonmouth
Agkistrodon piscivorus
2,770 observations
Common Box Turtle
Terrapene carolina
2,741 observations
Plains Garter Snake
Thamnophis radix
2,258 observations
Fowler's Toad
Anaxyrus fowleri
1,949 observations
Northern Leopard Frog
Lithobates pipiens
1,827 observations
Southern Leopard Frog
Lithobates sphenocephalus
1,800 observations
Gray Ratsnake
Pantherophis spiloides
1,556 observations
North American Racer
Coluber constrictor
1,195 observations
Prairie Lizard
Sceloporus consobrinus
1,132 observations · iNaturalist
Spring Peeper
Pseudacris crucifer
1,095 observations
Eastern Newt
Notophthalmus viridescens
1,087 observations
Western Ratsnake
Pantherophis obsoletus
1,084 observations
Boreal Chorus Frog
Pseudacris maculata
1,074 observations
Ring-necked Snake
Diadophis punctatus
1,040 observations
Spiny Softshell
Apalone spinifera
1,032 observations
Eastern Foxsnake
Pantherophis vulpinus
1,022 observations · iNaturalist
Plain-bellied Watersnake
Nerodia erythrogaster
957 observations
Spotted Salamander
Ambystoma maculatum
883 observations
Common Five-lined Skink
Plestiodon fasciatus
854 observations
Cave Salamander
Eurycea lucifuga
809 observations
Green Treefrog
Dryophytes cinereus
779 observations · iNaturalist
Gray Treefrog
Dryophytes versicolor
769 observations · iNaturalist
Small-mouthed Salamander
Ambystoma texanum
742 observations · iNaturalist
Eastern Milksnake
Lampropeltis triangulum
742 observations
Eastern Copperhead
Agkistrodon contortrix
739 observations
Rough Greensnake
Opheodrys aestivus
738 observations
Blue-spotted Salamander
Ambystoma laterale
691 observations
Northern Slimy Salamander
Plethodon glutinosus
618 observations
Eastern Fence Lizard
Sceloporus undulatus
573 observations
Broad-headed Skink
Plestiodon laticeps
536 observations
Red-bellied Snake
Storeria occipitomaculata
506 observations · iNaturalist
Marbled Salamander
Ambystoma opacum
488 observations
Eastern Red-backed Salamander
Plethodon cinereus
457 observations
Little Brown Skink
Scincella lateralis
450 observations
Western Ribbon Snake
Thamnophis proximus
441 observations
Prairie Kingsnake
Lampropeltis calligaster
432 observations · iNaturalist
Timber Rattlesnake
Crotalus horridus
409 observations
Western Slimy Salamander
Plethodon albagula
405 observations · iNaturalist
Northern Map Turtle
Graptemys geographica
405 observations