The muskox is a stocky, long-haired animal with a slight shoulder hump and a very short tail. 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. Coloration of the Greenland muskox, the race found in
The male musk ox weight more than the female and has longer horns. The extremely long outer coat and short, dense inner coat provide the musk ox with excellent insulation against the cold temperatures of the far north.