The fisher is a carnivoran of the family Mustelidae that inhabits forests of Canada and the United States. It prefers coniferous forests but also occurs in mixed and deciduous woodlands; it is adept at climbing trees but usually lives solitarily on the ground. It primarily preys on porcupines, snowshoe hares, and rodents, and also uses birds, fruits, insects, and carrion. Body length is 45–80 cm with a tail length of 30–40 cm; males are larger, and the winter coat is especially dense. Reproduction involves mating in spring followed by delayed implantation before birth. Conservation status: Least Concern.