The Black Wildebeest (Connochaetes gnou) is a fast runner and uses various visual and vocal methods to communicate. It is endemic to southern Africa, feeding mainly on grass. It is also called the white-tailed gnu, favoring areas of open plains and grasslands close to a water source. The coat is dark brown or black while its forelegs and underparts may have dark-colored hair. The horse-like tail is long and white. Both sexes have strong, forward curving horns, and females are slender and smaller than males. Males are also darker and have bushy, dark-tipped manes. Black wildebeest are migratory and herds can be composed of territorial bulls, females, or bachelors.