Addax nasomaculatus

The addax (Addax nasomaculatus), also known as the white antelope and the screwhorn antelope, is an antelope native to the Sahara. The only member of the genus Addax, it was first described scientifically by Henri de Blainville in 1816. As suggested by its alternative name, the addax has spiral horns that are long in females and in males. In the winter, its coat is greyish-brown with white hindquarters and legs, and long, brown hair on the head, neck, and shoulders; in the summer, the coat turns almost completely white or sandy blonde. Males stand from at the shoulder, with females at . They are sexually dimorphic, as the females are generally smaller than the males.

The addax lives in arid regions, semideserts, and sandy and stony deserts in North Africa. It mainly eats grasses and leaves of shrubs, leguminous herbs, and bushes. It can live without water for long periods of time. Addax form herds of five to 20 members, consisting of both males and females. The herd is usually led by one dominant male. Breeding season is at its peak during winter and early spring.