The Scimitar oryx, or scimitar-horned oryx, (Oryx dammah), also known as the sahara oryx, is a species of Oryx now extinct in the wild. It formerly inhabited all of North Africa. It has a long taxonomic history since its discovery in 1816 by Lorenz Oken, who named it the Oryx algazel. This spiral-horned antelope stands a little more than 1 metre (3.3 ft) at the shoulder. The males weigh 140–210 kg (310–460 lb) and the females weigh 91–140 kg (200–310 lb). The coat is white with a red-brown chest and black markings on the forehead and down the length of the nose. The calves are born with a yellow coat, and the distinguishing marks are initially absent. The coats change to adult coloration at 3–12 months old.