Gray wolves, or timber wolves, average 70 to 145 pounds for males and 60 to 100 pounds for females, but they can weigh up to 176 pounds. Their bodies average 3 to 5 feet long with tails that measure another 1 to 2 feet.
Generally, a wolf's size is also geographically dependent. Wolves in southern regions tend to be smaller, and northern wolves tend to be larger.
Gray wolves are the largest wild members of their species, the canids, and they are direct ancestors of domestic dogs. They are predators that specialize in hunting large-hoofed animals, but they also eat rodents, rabbits and hares. They are also known to scavenge carrion. They are important for regulating populations of their prey and are popular subjects of ecotourism.