The roan antelope is a savanna antelope found in West and Central Africa. It is the namesake of the Chevaline project, whose name was taken from the French Antilope Chevaline. Roan antelope are one of the largest species of antelopes; only elands, bongos and large male greater kudus can exceed them in weight. They measure from the head to the base of tail and the tail measures. The body mass of males is and of females is. The shoulder of this species is typically around. Named for their roan colour, they have lighter underbellies, white eyebrows and cheeks and black faces, lighter in females. They have short, erect manes, very light beards and prominent red nostrils. The horns are ringed and can reach a metre long in males, slightly shorter in females. They arch backwards slightly. They are similar in appearance to the sable antelope and can be confused where their ranges overlap. Sable antelope males are darker, being brownish-black rather than dark brown. Roan antelope are found in woodland and grassland savanna, mainly in the tropical and subtropical grasslands, savannas, and shrublandsbiome, which range in tree density from forest with a grassy understory to grasslands dotted with few trees, where they eat mid-length grasses. They form harem groups of five to 15 animals with a dominant male. Roan antelope commonly fight among themselves for dominance of their herd, brandishing their horns while both animals are on their knees.
Taxonomy and evolution
The roan antelope shares the genusHippotragus with the extinctbluebuck and the sable antelope, and is a member of the familyBovidae. It was first described by French naturalist Étienne Geoffroy Saint-Hilaire in 1803. The specific epithetequinus derives from the Latinequus, referring to the horse-like appearance of this antelope. In 1996, an analysis of mitochondrial DNA extracted from a mounted specimen of the bluebuck that it was outside the clade containing the roan and sable antelopes. The study therefore concluded that the bluebuck is a distinct species, and not merely a subspecies of the roan antelope. The cladogram below shows the position of the roan antelope among its relatives, following the 1996 analysis: In 1974, palaeoanthropologist Richard Klein studied the fossils of Hippotragus species in South Africa. Most of these were found to represent the bluebuck and the roan antelope. The roan antelope seems to have appeared in the Nelson Bay Cave region following climatic changes in the Holocene.
The roan antelope is a large antelope with a horse-like build. It is the largest antelope in the genus Hippotragus. The roan antelope stands at the shoulder, and weighs. The head-and-body length is typically between. The dark tail, terminating in a black tuft, measures. Characteristic features include a short and erect mane of greyish brown hair extending from the back of the neck along the midline of the back up to the rump, white patches around the eyes and the mouth on the otherwise black face, and long, narrow ears with long tufts. The long legs are supported by large hooves. The short, smooth coat is brown to amber. The ventral parts are yellow to white, while the neck and the mane are grey to black. The sable antelope is notably darker; it has a brownish-black coat.
