The name given to a group of African and Asian hoofed ruminants of the order Artiodactyla. The 91 species in 31 genera are classified in five sub-families (Bovinae, Cephalophinae, Hippotraginae, Antilopinae, and Caprinae) in the family Bovidae. This group includes the bongos and kudus (Tragelaphus), elands (Taurotragus), duikers (Cephalophus and Sylvicapra), waterbucks (Kobus), reedbucks (Redunca), roan and sable antelopes (Hippotragus), oryx (Oryx), wildebeests or gnus (Connochaetes), impalas (Aepyceros), blackbucks (Antilope), gerenuks (Litocranius), gazelles (Gazella), and springbucks (Antidorcas). One genus (Pseudonovibos) was described only on the basis of a series of 14 horns from Cambodia and Viet Nam; the living animal has never been seen by scientists.