Orrorin (name meaning "Original Man") is a postulated early species of Homininae, estimated at 6.1 to 5.7 million years ago and discovered in 2000. It is not confirmed how Orrorin is related to modern humans. Its discovery was used to argue against the hypothesis that australopithecines are human ancestors, although this remains the most prevalent hypothesis of human evolution as of 2012.
In the Series 4 episode "New Arrivals", a troop of Orrorin were brought to the park from Late Miocene Africa, 6 million years ago. They reside in the Ape-Men Jungle Enclosure with their relatives.