The nyala (Nyala angasii or Tragelaphus angasii), also called inyala, is a spiral-horned antelope native to southern Africa. It is a species of the family Bovidae and genus Nyala, also considered to be in the genus Tragelaphus. It was first described in 1849 by George French Angas. The nyala is mainly active in the early morning and the late afternoon. It generally browses during the day if temperatures are 20–30 °C (68–86 °F) and during the night in rainy season. The nyala’s range includes Malawi, Mozambique, South Africa, Swaziland and Zimbabwe. It has been introduced to Botswana and Namibia, and reintroduced to Swaziland, where it was extinct since the 1950s. Its population is stable and it has been listed as of Least Concern by the International Union for Conservation of Nature (IUCN). The principal threats to the species are poaching and habitat loss resulting from human settlement. The males are highly demanded as game animals in Africa.
The coat is rusty or rufous brown in females and juveniles, but grows a dark brown or slate grey, often tinged with blue, in adult males. Females and young males have ten or more white stripes on their sides. Only males have horns, 60–83 cm (24–33 in) long and yellow-tipped. It exhibits the highest sexual dimorphism among the spiral-horned antelopes.
As a herbivore, the nyala feeds upon foliage, fruits and grasses, with sufficient fresh water. A shy animal, it prefers water holes rather than open spaces.
The nyala does not show signs of territoriality, and individual areas can overlap each other. They are very cautious creatures. Old males live alone, but single sex or mixed family groups of up to 10 individuals can be found. These inhabit thickets within dense and dry savanna woodlands.