A slender, long-bodied mammal with short legs and well-furred tail about half the length of the head and body. The head is small, flattened and only slightly larger in diameter than the long neck. The ears are short and rounded, the whiskers prominent and the small eyes beady. In summer, adults are usually dark brown above and yellowish white below with a white chin and black tail tip. In winter, the coat is paler but sometimes in northern Missouri they have an all-white coat except for the black tail tip.