||Agkistrodon piscivorus, the Cottonmouth, is about 2 to 3 feet long, but may approach 4 feet. Agkistrodon piscivorus's habitat in the summer is often sloughs and swamps or other wet areas, and in the fall, it migrates to rock outcroppings. The Cottonmouth is nocturnal, and gets its name from opening its mouth when threatened. Agkistrodon piscivorus eats snails, fish , amphibians, snakes, and mammals. It gives birth in early September. The range of Agkistrodon piscivorus includes from Virginia, south into Florida and west to eastern and central Texas and then north to central Missouri and Southern Illinois. Cottonmouths are venomous.