The cottonmouth moccasin is a venomous water snake that is native to North America. It is also known by several other names, including the water moccasin, the swamp moccasin, and the black moccasin. The cottonmouth moccasin gets its name from the cottony-white coloration on the inside of its mouth, which it displays when feeling threatened. The snake's dark scales provide camouflaging in its habitat, which typically includes streams, rivers, and swamps. The cottonmouth moccasin is a formidable predator, feeding on fish, frogs, and even other snakes. Despite its reputation, the cottonmouth moccasin rarely poses a threat to humans.