The waterbuck (Kobus ellipsiprymnus) is a large antelope found widely in sub-Saharan Africa. It is placed in the genus Kobus of the family Bovidae. It was first described by Irish naturalist William Ogilby in 1833. The thirteen subspecies are grouped under two varieties: the common or ellipsen waterbuck and the defassa waterbuck. The head-and-body length is typically between and the average height is between . A sexually dimorphic antelope, males are taller as well as heavier than females. Males reach approximately at the shoulder, while females reach . Males typically weigh and females . The coat colour varies from brown to grey. The long, spiral horns, present only on males, curve backward, then forward and are long.