Orrorin tugenensis is estimated to be about 6 million years old, meaning O. tugenensis lived near the time when genetic analyses suggest our oldest hominid ancestor split from the oldest ancestor of the great apes. Certain features, like the teeth, suggest this species could even be more closely related to Homo sapiens than the many Australopithecus species. The species is considered to have been bipedal. Unfortunately, the suggested relationship between it and Homo sapiens, is extremely speculative.