The Nubian ibex is relatively small compared to other ibexes. Its coat is a light sandy brown in colour with the hindquarters lighter. The underparts are almost white, and the upper side of the tail is darker. Bucks have a dark stripe on their front legs and one down their back, as well as a dark beard. During the October rut, the neck, chest, shoulders, upper legs and sides of bucks become dark brown to almost black in colour. The semicircular horns curve upward, backwards and finally down. While they are found in both sexes, but are much larger in males than females. Horns on bucks grow up to 120 cm / 48 inches long, and have 24-36 knobs on the outer curve. The much thinner, shorter horns of females grow up to 35 cm / 14 inches.