 consider that the "Bos" genus most likely arose in Africa descended from "Pelorovis oldowayensis", described by Hans Reck in 1928 from Olduvai Gorge, Tanzania, which was itself derived from the older species "P. turkanensis" described from northern Kenya.Both "Pelorovis" species were moved to genus "Bos" by Martínez-Navarro "et al".in 2014, which would make the oldest "Bos" species African.