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Hunting and diet
Fishers are solitary hunters. Their primary prey include hares, rabbits, squirrels, mice, shrews, and porcupines. While fishers and mountain lions are the only regular predators of porcupines, the fisher is the only predator to have a specialized killing technique. As observed by Robert G. Snyder in the Adirondack mountains of New York, a fisher first approaches from the direction the porcupine is facing. The porcupine tries to protect itself by turning to present its tail, covered with quills, to the attacker. The fisher then jumps directly over its prey, forcing the porcupine to keep turning to protect its vulnerable head. A dozen or more such maneuvers suffice to exhaust and confuse the porcupine into a stupor in which it can no longer protect itself. Then, by repeatedly biting and scratching at the porcupine's face, the fisher causes it to bleed to death. The fisher eats the porcupine by flipping the dead animal over and starting with its unprotected belly.
Fishers are also known to eat ground nesting birds such as grouse and turkeys. Often, young of the year and eggs make easy targets. Also, in some areas fishers can become pests to farmers because they will get into a pen and kill large numbers of chickens. Fishers have also been known to eat small pets left outside, such as stray cats and dogs. While this is rare, when densities are high and food resources are low, animals may become desperate.