The Cottonmouth Snake, also known as the Water Moccasin, is a venomous snake found primarily in the southeastern United States. It typically inhabits wetlands, swamps, and rivers, where it can be seen swimming or basking on riverbanks. The snake is recognizable by its thick body, triangular head, and distinctive white mouth lining, which it displays when threatened. Cottonmouths are generally dark in color, ranging from brown to black, with lighter patterns. They are known for their aggressive behavior when cornered and can deliver a painful bite. Despite their venom, they play an important role in controlling rodent populations in their ecosystems.