Taxonomists now classify muskoxen with the sheep and goats.
The closest living relative of the muskox is the takin, a large goat-like animal which is found in the Himalayas. Muskoxen as a species have changed little since the ice age and are perfectly adapted to live in their harsh arctic environment. Both sexes have horns, but the horns of bulls are larger and heavier than those of cows. The horns of bulls develop large bases which nearly span the entire forehead. The pelage consists of a long, coarse, outer layer and a short, fine underhair.