 Fishers are a medium-sized mammal, comparable in size to the domestic cat, and the largest species in the marten genus. Their bodies are long, thin, and low to the ground. The sexes have similar physical features but they are sexually dimorphic in size, with the male being much larger than the female. Males are 90 to 120 cm (35 – 47 in) in length and weigh 3.5 to 6 kg (8 – 13 lb). Females measure 75 to 95 cm (30 – 37 in) and weigh 2 to 2.5 kg (4 – 6 lb). The largest male fisher ever recorded weighed 9 kg (20 lb).
