Polecat kin are two animals that share a similar family tree. The first is the FERRET, which is a small mammal with a long, slender body and a tail that is usually brown or black in color. The second is the MINK, which is a semi-aquatic mammal that is related to the weasel and has a dark brown fur coat. Both of these animals are members of the Mustelidae family, which includes other animals such as otters, badgers, and wolverines.