Wolf in winter NPS. The gray wolf (Canis lupus), also known as the timber wolf, has been the prevailing predator of Isle Royale National Park since its arrival to the island in the late 1940's. The gray wolf gets its name from the thick, gray fur coat covering its body. While most wolves are gray, their coats can range in color from reddish to solid black. On average, adult wolves are five to six feet in length, with females weighing 50-85 pounds and males weighing 70-110 pounds. A wolf will hunt small prey such as snowshoe hare and beaver, however, they often live in small packs of four to eight members and work together hunting larger prey like moose.