Water moccasins, also known as cottonmouths, are a type of venomous snake found primarily in the southeastern United States. They are typically recognized by their thick bodies, triangular heads, and dark coloration, which can range from brown to black. These snakes are often found near water sources like swamps, rivers, and lakes, where they hunt for fish and amphibians. Water moccasins are known for their defensive behavior. When threatened, they may open their mouths wide to display the white interior, which is where the name "cottonmouth" comes from. While their venom can be dangerous, they usually prefer to avoid human contact and will retreat if given the chance.