This beaver is the largest rodent in North America. Adults usually weigh from 24 to 71 lb., with 44 lb. being a typical mass. The head-and-body length is 29–35 in, with the tail adding a further 7.9–14 in. The beaver is semi-aquatic. It has a large flat paddle-shaped tail and large webbed hind feet. The unwebbed front paws are smaller, with claws. A thick layer of fat under its skin insulates the beaver from its cold water environment.
Fun Fact The eyes are covered by a nictitating membrane which allows the beaver to see underwater.