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Aquatic and semiaquatic mammals are a diverse group of mammals that dwell partly or entirely in bodies of water.
Semiaquatic river otters, like other amphibious mammals, have dense, thick fur and streamlined bodies designed for life in the water. There are several species; the North American river otter lives along rivers, lakes and large creeks. River otters weigh up to 18 pounds and reach up to 4 feet long, including their tails.
Beavers, Nutria and Muskrat
Primarily aquatic, beavers are found in rivers and lakes in Europe, Asia and throughout North America, except northern Canada, the southern deserts of the United States and Mexico. They have a waterproof coat, closable ears, closable nostrils, paddle-shaped tail and webbed feet.
Introduced intentionally and accidentally to North America, the nutria or coypus is native to Central and South America. Well adapted to a semiaquatic life, nutria have small eyes and ears, and large, webbed hind feet for swimming.
Muskrats are good swimmers and can stay underwater up to 17 minutes, preferring to live in 4 to 6 feet of water. Found in swamps, marshes, and wetlands from northern North America to the Gulf coast and the Mexican border.