The handsome slate-brown shaggy coat of the Nyala is marked with white vertical stripes and spots on the flanks. Rams appear more charcoal-grey in colour. The rams have long inward curved horns and a white chevroned face. They have a ridge of long hairs along the underparts, from behind the chin to between the hind legs, they also have a mane of thick, black hair from the head along the spine to the rump. The nyala is used as a marker to distinguish between the names given to the males and females of other antelope species. This is because of the drastic difference in size between the male and female nyala. The male nyala is classified as a bull, while the female is classified as a ewe. Any male antelope smaller than the nyala bull is classified as a ram, and any female antelope bigger than the nyala female is classified as a cow.