The term 'web-footed rodent' refers to two species of aquatic rodents, the COYPU (Myocastor coypus) and the water rat (Hydromys chrysogaster). The COYPU is a large, semi-aquatic rodent native to South America, with webbed hind feet and a thick, dark brown coat. The water rat is a small, semi-aquatic rodent native to Australia and New Guinea, with webbed hind feet and a light brown coat. Both species are found in wetlands and rivers, and feed on aquatic plants, fish, and invertebrates.