Field Guide

The plains hog-nosed snake has probably been extirpated from Missouri. It has a sharply upturned snout, black pigment on the underside of the tail, and was only known from the loess hill region of extreme northwest Missouri.

The western foxsnake is a moderately large snake with distinct brown blotches. In Missouri, it is rare and found only in our far northwestern counties.

Missouri's largest snake, the bullsnake may hiss loudly and vibrate its tail when alarmed, but it is nonvenomous. This species is extremely valuable in controlling destructive rodents.

The cottonmouth is named for the cotton-white lining of its mouth, which it opens widely when alarmed. This dangerously venomous, semiaquatic snake occurs in the southeastern corner of Missouri, with a spotty distribution in the Ozark Region.

The prairie massasauga is a medium-sized rattlesnake associated with bottomland prairie habitats in north-central and northwestern Missouri. This endangered species is shy, reclusive, and nonaggressive.

Missouri’s largest venomous snake, the timber rattlesnake, is dangerously venomous, but there are few cases of rattlesnake bites in our state. It frequents rough country, is mostly nocturnal in summer, and few Missourians ever encounter it.

The broad-banded watersnake is a semiaquatic snake with broad, irregularly shaped bands that can be brown, reddish brown, or black and are separated by yellow or gray. This nonvenomous species is restricted to the southeastern corner of the state.

The northern diamond-backed watersnake is our largest watersnake. It has numerous diamond-shaped light markings along the back. It occurs in the Bootheel and north along the Mississippi River, and in much of northern and western Missouri. It doesn’t occur in the Ozarks or in much of central-eastern Missouri.