- water moccasin, cottonmouth, cottonmouth moccasin, Agkistrodon piscivorus - venomous semiaquatic snake of swamps in southern United States
--1 is a kind of pit viper
--1 is a member ofAgkistrodon, genus Agkistrodon, Ancistrodon, genus Ancistrodon - water moccasin - any of numerous North American water snakes inhabiting fresh waters
--2 is a kind of water snake
--2 is a member of Natrix, genus Natrix