Massasauga
Pictures

A Massasauga Rattlesnake hides in the leaves. Massasaugas are small snakes with thick bodies, heart-shaped heads, and vertical pupils.

A juvenile western Massasauga rattlesnake from northern Missouri. Massasaugas have colors and markings that include tan, gray, or brown with dark brown or black splotches.

A small Massasauga rattlesnake with only one button on its tail. The rattle is actually a series of interlocking scale segments, which make a buzzing noise when the tail is vibrated.