Pekania is a genus of mustelid that contains a single living species, the fisher (Pekania pennanti). The Mustelidae are a family of carnivorous mammals, including weasels, badgers, otters, ferrets, martens, minks and wolverines, among others. Mustelids are a diverse group and form the largest family in the order Carnivora. They are typically small animals with elongated bodies, short legs, short skulls, short, round ears, and thick fur. Most mustelids are solitary, nocturnal animals, and are active year-round.