Illinois
Snakes in Pulaski County
20 species have been documented here, 3 of them venomous.
Venomous snakes in Pulaski County
Full guide & what to do if bitten →
Northern CottonmouthAgkistrodon piscivorusVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
Eastern CopperheadAgkistrodon contortrixVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
Timber RattlesnakeCrotalus horridusVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in Pulaski County
Black Kingsnake
Lampropeltis nigra
Harmless
Plain-bellied Watersnake
Nerodia erythrogaster
Harmless
Gray Ratsnake
Pantherophis spiloides
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
North American Racer
Coluber constrictor
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Northern Cottonmouth
Agkistrodon piscivorus
Venomous
Diamondback Watersnake
Nerodia rhombifer
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Common Wormsnake
Carphophis amoenus
Harmless
Common Ribbon Snake
Thamnophis saurita
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Smooth Earthsnake
Virginia valeriae
Harmless
Mudsnake
Farancia abacura
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Prairie Kingsnake
Lampropeltis calligaster
Harmless
Eastern Copperhead
Agkistrodon contortrix
Venomous
Rough Greensnake
Opheodrys aestivus
Harmless
Timber Rattlesnake
Crotalus horridus
Venomous
Eastern Kingsnake
Lampropeltis getula
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.