Agkistrodon piscivorus leucostoma, commonly known as the Western Cottonmouth or Water moccasin, is thick-bodied like others on this list, but maintains complexions of saw-like edges and bands difficult to see with the naked eye. These snakes are visible with their lighter cream pinstripes, big white mouths, and elliptical pupils, and do stand out with massive triangular heads that make it easy to confuse with Floridian species or other dark-colored snakes near bodies of water.