This document discusses several types of wolves, including the gray wolf which was once the most widespread mammal on earth, the endangered red wolf which is very hard to find, the Mexican gray wolf that lives in the deserts of Mexico, the arctic wolf that inhabits the arctic regions of Alaska and Canada, and the great plains wolf also known as the buffalo wolf that was most common in the U.S. It also notes that the European wolf lives and hunts in packs with its family.