Fisher, rarely seen forest predator once eliminated in Pa., spotted on trail cam outside Pittsburgh: ‘Like Christmas morning’

Fisher Exact test

Fisher cats: Animals that aren't cats, nor are they really fishers

Spot a "fisher cat" in your neighborhood? Here's what you should know about the carnivorous critter

THIS ANIMAL does not care that you have 30,000 DEADLY QUILLS. [SIMULATED] The fisher is one of North America's most secretive and lethal predators, a dark brown weasel that ghosts through dense northern forests with a killing technique so specialized it's become legendary. When a porcupine leave its den, covered in 30,000 barbed quills, most predators know better than to attack, but the fisher doesn't hesitate. Using lightning-quick agility, the fisher circles the porcupine relentlessly, dodging