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Orrorin is considered to be the second-oldest known hominin ancestor that is possibly related to modern humans. Only one species is known: Orrorin tugenensis. The name was given by the discoverers who found Orrorin fossils in the Tugen Hills of Kenya. The fossils were found were estimated to date between 6.1 and 5.8 million years ago, during the late Miocene. view more...