DESCRIPTION: Can be 3-4 feet long including tail and weigh 11-33 pounds, with males generally larger than females.  The head is rounded and flattened, and the ears are small.  The neck is short and thick.  Fur on the upper parts is varying shades of brown, with light brown or gray on the belly.  The throat may have a silver or white patch.  The fur has a heavy, soft, oily underfur overlain by glossy, smooth guard hairs.  The feet are webbed, and the tail is slightly flattened, muscular at the base, and tapers to a point.  Like all mustelids, they have a long body with relatively short legs.