Snakes
Order Squamata, Suborder Serpentes

Venomous

All of North America's venomous snakes, except coral snakes, are pit vipers (family Crotalidae).  North American pit vipers have a deep, heat-sensitive loreal "pit" located between the eyes and nostrils of the snake (seen clearly on the copperhead), and front hinged fangs with a mostly hemotoxic venom which affects the muscle tissue and circulatory system.  Coral snakes belong to the family Elapidae, front fixed fangs with a mostly neurotoxic venom which affects the central nervous system.  Other elapids include the cobras and mambas.


Copperhead
Agkistrodon contortrix
Juvenile Cottonmouth
Agkistrodon piscivorus
Cottonmouth
Agkistrodon piscivorus
Pygmy Rattlesnake
Sistrurus miliarius
Massasauga
Sistrurus catenatus
Western Diamondback
Rattlesnake
Crotalus atrox
Prairie Rattlesnake
Crotalus viridis
Timber Rattlesnake
Crotalus horridus





















Nonvenomous

Family Colubridae - harmless, egg-laying snakes (oviparous)
Bullsnake
Pituophis catenifer
Great Plains
Ratsnake

Pantherophis emoryi
Western (Black)
Ratsnake

Pantherophis obsoletus
Speckled Kingsnake
Lampropeltis getula
Prairie Kingsnake
Lampropeltis calligaster
Racer
Coluber constrictor
Plains Blackhead
Snake

Tantilla nigriceps
Ground Snake
Sonora semiannulata
Rough Greensnake
Opheodrys aestivus
Milksnake
Lampropeltis gentilis
Coachwhip
Coluber flagellum




























Family Natricidae - harmless, live-bearing snakes (ovoviviparous)
Lined Snake
Tropidiclonion lineatum
Western Ribbonsnake
Thamnophis proximus
Plains Gartersnake
Thamnophis radix

Blotched Watersnake
Nerodia erythrogaster
Diamondback Watersnake
Nerodia rhombifer
Northern Watersnake
Nerodia sipedon
Broadbanded Watersnake
Nerodia fasciata



















Family Xenodontidae - robust, rear-fanged snakes
Western Hognose Snake
Heterodon nasicus
Eastern Hognose Snake
Heterodon platirhinos












Family Dipsadidae - slender, rear-fanged snakes
Western Wormsnake
Carphophis vermis
Ringneck Snake
Diadophis punctatus