Nyala (Tragelaphus angasi – Gray, 1849) are one of the most beautiful African antelope. There is a striking difference in the males and females. Nyala are the dividing line when it comes to gender terminology in antelope. Males are referred to as bulls and females as ewes. The ewes are as equally striking as the bulls. They lack horns and are a rich chestnut colour with a varying number of vertical white stripes. Although nyala herds of up to 30 animals have been observed the only social bonding of any duration is between a mother and her calf. Groups of 2 – 4 animals are more commonly seen. The rest of the social structure appears to be very loose with individuals coming and going. Nyala prefer riverine habitat.
Bulls are larger than the females and have a shaggy coat, which is very well developed on the underside. They have a dorsal crest of white hairs running from occiput to the root of the tail. The bulls have a white chevron between the eyes (absent in females) and are dark brown along the neck, back upper legs and flanks. Contrasting sharply with this is the chestnut to orange legs. There are vertical white stripes along the back. Horns are well developed usually with a single open curve – dark brown to black in colour with ivory tips. Tail is bushy and dark coloured with a white underside in the males. Bulls may become solitary, as they get older.