Cottonmouths, also known as water moccasins, are venomous snakes found primarily in the southeastern United States. They thrive in wetland habitats, such as swamps, marshes, and rivers. These snakes are recognizable by their dark, thick bodies and distinctive white mouths, which they display when threatened. Cottonmouths are semi-aquatic and are often seen basking on logs or swimming in water. They primarily feed on fish, amphibians, and small mammals. While their venom can be dangerous, they typically avoid human contact and will only bite in self-defense.