They live on the edges of lakes, streams and rivers in forested areas. Adult males average two feet in length, including an eight-inch tail. Females are 10-15 percent smaller than males and up to half a pound lighter. A mink's coat is thick, full and soft. A short, tight layer of underfur is covered with longer guard hairs, which give the pelt its luster.
Colors range from russet to a deep, chocolate brown.
Unlike some weasels, the mink does not turn white in winter. Minks have excellent hearing and sight, and a good sense of smell. On land, they travel at a slow, arch-backed walk or a bounding lope, which they can keep up for miles. Minks are most active at night and early morning, although they sometimes venture out during the day as well. Active year-round, minks may curl up and sleep for several days during winter cold spells.