Reduncini are water-dependent, grazing, small to large antelopes with high crowned teeth. The two living genera are Kobus (kobs, lechwes, and waterbuck) and the smaller genus Redunca (reedbucks). Only the male Reduncini have horns in modern examples.
This cranium of Kobus kob has two complete horncores but is missing its dentition. The horn cores are usually short and stout and and curl backwards.
This specimen was found by Robert Moru in Area 10.
Four species of Kobus are recognised in the Koobi Fora Formation, Kobus kob, Kobus lechwe, Kobus sigmoidalis, Kobus ancustocera and Kobus ellipsyprymnus. An additional species now extinct, Menelikia lyrocera was not uncommon. The extinct genus Menelikia was a common component of Pliocene faunas in East Africa but survived only until the beginning of the Pleistocene.