Orrorin tugenensis is considered to be the second oldest - after Sahelanthropus
- known hominin ancestor that is possibly related to modern humans, and it is the only species classified in genus Orrorin. Orrorin tugenensis is significant in the origins of human evolution because it can be classified as an early bipedal hominin. [Haviland et al. 2007].
The name was given by Brigitte Senut and Martin Pickford, who found the Orrorin tugenensis fossils in the Tugen Hills of Kenya in 2000.