Simbakubwa  Simbakubwa kutokaafrika ("great lion from Africa") is an extinct species of mammal of the family Hyainailouridae in the order Hyaenodonta. It lived during the early Miocene of Kenya. The type specimen was recovered from deposits dated to be 23 million years old. Possibly reaching up to , it might have surpassed the modern polar bear in size. The fossils of "Simbakubwa" were first discovered by rural Kenyans at Meswa Bridge, Western Kenya thereafter Matthew Borths and Nancy Stevens published the findings after examining the fossils which had been stored at the Nairobi National Museum in Kenya for decades. The type specimen consists of a mandible from the lower jaw, a right upper maxilla and some postcranial remains. The light wear patterns on the dentition indicate that the holotype specimen was a young adult at the time of its death. The study of the postcranial remains indicates "Simbakubwa" was possessed of a semi-digitigrade walking stance. "Simbakubwa", like other hyainailourids, probably was a specialist hunter and scavenger that preyed on creatures such as rhinoceroses and early proboscideans. It may have been somewhat less specialized in crushing bone than its later relatives such as "Hyainailouros". However, like "Hyainailouros", "Simbakubwa" possessed lingually rotating carnassial blades, ensuring a constant shearing edge throughout its life.