Water snakes are a type of non-venomous snake found in freshwater habitats around the world. The term 'water snake' is used to refer to several different species, including the MOCCASIN, ANACONDA, and HYDRA. The MOCCASIN is a species of water snake found in North America, typically inhabiting swamps, marshes, and other wetlands. The ANACONDA is a large, non-venomous snake found in tropical South America, and is the heaviest snake in the world. The HYDRA is a species of water snake found in Europe, Asia, and Africa, and is known for its ability to regenerate lost body parts.