The gray wolf originally hails from Eurasia and North America, but various subspecies have since migrated to other parts of the world. Gray wolves are distinguished from other Canis species by their larger bodies, longer tails and shorter muzzles and ears. More than 30 distinct subspecies have been identified. The wolf is closely related to other Canis species, including the coyote and golden jackal. They can interbreed with other species in this genus; this occurs rarely in the wild, but regularly in captivity. Wolves' fur is usually mottled with brown, black, gray and white stripes. However, arctic subspecies have been seen with almost completely white fur.