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Reptiles & Amphibians of Illinois

The reptiles & amphibians most often spotted in Illinois, ranked by recent research-grade observations.

98,491
recent observations
50
species listed
50
reptiles & amphibians

Naturalists have logged 98,491 research-grade observations across the 50 most-recorded species in Illinois. The most frequently seen is the American Toad, with 9,165 recorded sightings.

Most-observed reptiles & amphibians in Illinois

American Toad
Anaxyrus americanus
9,165 observations
Pond Slider
Trachemys scripta
6,176 observations
Painted Turtle
Chrysemys picta
5,825 observations
American Bullfrog
Lithobates catesbeianus
5,732 observations
Common Garter Snake
Thamnophis sirtalis
5,467 observations
DeKay's Brownsnake
Storeria dekayi
4,565 observations
Common Watersnake
Nerodia sipedon
4,379 observations
Blanchard's Cricket Frog
Acris blanchardi
4,343 observations
Common Snapping Turtle
Chelydra serpentina
3,903 observations
North American Green Frog
Lithobates clamitans
3,302 observations
Three-toed Box Turtle
Terrapene triunguis
3,273 observations
Northern Cottonmouth
Agkistrodon piscivorus
3,123 observations
Common Box Turtle
Terrapene carolina
2,924 observations
Plains Garter Snake
Thamnophis radix
2,417 observations
Fowler's Toad
Anaxyrus fowleri
2,273 observations
Northern Leopard Frog
Lithobates pipiens
2,057 observations
Southern Leopard Frog
Lithobates sphenocephalus
1,949 observations
Central Ratsnake
Pantherophis alleghaniensis
1,676 observations
North American Racer
Coluber constrictor
1,257 observations
Prairie Lizard
Sceloporus consobrinus
1,241 observations
Spring Peeper
Pseudacris crucifer
1,188 observations
Eastern Newt
Notophthalmus viridescens
1,157 observations
Boreal Chorus Frog
Pseudacris maculata
1,144 observations
Western Ratsnake
Pantherophis obsoletus
1,142 observations
Spiny Softshell
Apalone spinifera
1,119 observations
Eastern Foxsnake
Pantherophis vulpinus
1,115 observations
Ring-necked Snake
Diadophis punctatus
1,093 observations
Plain-bellied Watersnake
Nerodia erythrogaster
1,002 observations
Common Five-lined Skink
Plestiodon fasciatus
937 observations
Spotted Salamander
Ambystoma maculatum
917 observations
Green Treefrog
Dryophytes cinereus
906 observations · iNaturalist
Cave Salamander
Eurycea lucifuga
891 observations
Rough Greensnake
Opheodrys aestivus
826 observations
Gray Treefrog
Dryophytes versicolor
795 observations · iNaturalist
Eastern Copperhead
Agkistrodon contortrix
791 observations
Eastern Milksnake
Lampropeltis triangulum
785 observations
Small-mouthed Salamander
Ambystoma texanum
763 observations
Blue-spotted Salamander
Ambystoma laterale
715 observations
Northern Slimy Salamander
Plethodon glutinosus
679 observations
Eastern Fence Lizard
Sceloporus undulatus
612 observations
Broad-headed Skink
Plestiodon laticeps
562 observations
Red-bellied Snake
Storeria occipitomaculata
557 observations
Marbled Salamander
Ambystoma opacum
522 observations
Little Brown Skink
Scincella lateralis
493 observations
Western Ribbon Snake
Thamnophis proximus
466 observations
Eastern Red-backed Salamander
Plethodon cinereus
463 observations
Timber Rattlesnake
Crotalus horridus
463 observations
Prairie Kingsnake
Lampropeltis calligaster
460 observations
Northern Map Turtle
Graptemys geographica
453 observations
Western Slimy Salamander
Plethodon albagula
428 observations

Built from recent research-grade iNaturalist observations. Identifications are community-sourced and may occasionally be wrong, and the ranking reflects where people record and photograph wildlife, so a species seen often here is not necessarily rare elsewhere. Some plants and animals are only out in certain seasons. Treat this as a lively snapshot of what people are finding, not a formal checklist.

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