types:
hoop snake
any of various harmless North American snakes that were formerly believed to take tail in mouth and roll along like a hoop
leaf-nosed snake
any of various pale blotched snakes with a blunt snout of southwestern North America
racer
slender fast-moving North American snakes
rat snake
any of various nonvenomous rodent-eating snakes of North America and Asia
king snake,
kingsnake
any of numerous nonvenomous North American constrictors; feed on other snakes and small mammals
water snake
any of various mostly harmless snakes that live in or near water
black-headed snake
small secretive ground-living snake; found from central United States to Argentina
vine snake
slender arboreal snake found from southern Arizona to Bolivia
lyre snake
mildly venomous snake with a lyre-shaped mark on the head; found in rocky areas from southwestern United States to Central America
pine snake
any of several bull snakes of eastern and southeastern United States found chiefly in pine woods; now threatened
water moccasin
any of numerous North American water snakes inhabiting fresh waters