Megistotherium osteothlastes was a large hyaenodontid creodont that lived during the early Miocene epoch some 23 million years ago. Its remains have been found in the Ngorora and Muruyur Formations of Kenya, Egypt,[2] Namibia, Uganda[3] and Libya. Named by Robert Savage in 1973,[1] it's one of the largest hyaenodontids known and like the other hyaenodontids it had an enormous skull relative to its body, up to 66 cm (2 ft 2 in) in length[1] and a body mass estimated at 500 kg (1,100 pounds).[4]