Pekania pennanti, commonly known as the fisher, is a medium-sized mammal native to North American forests. It has a long, slender body, bushy tail, and dark brown fur. Fishers are known for their agility and are one of the few predators of porcupines.

Pekania pennanti, commonly known as the fisher, is native to North America. Its geographical distribution spans from the boreal forests of Canada southward into the northern United States, including parts of the Pacific Northwest, the Northeast, and the Great Lakes region. While historically found in a continuous range across these areas, habitat loss and human activities have led to more fragmented populations.

Fishers are typically found in mixed hardwood-coniferous forests. They prefer dense forested areas with plenty of underbrush and fallen logs, which provide both cover and hunting grounds. The climate in these regions tends to be temperate or boreal, with cold winters and warm summers, which suits the fisher's thick fur and hunting habits.

Fishers are solitary, carnivorous mammals known for their agility in climbing trees and their ability to hunt small mammals, birds, and even porcupines. They play an important role in controlling prey populations and maintaining ecological balance in their habitats. Their preference for large, contiguous forest areas makes them sensitive to deforestation and habitat fragmentation.