'Millennium Ancestor', a 6-million-year-old bipedal hominid from Kenya - Recent discoveries push back human origins by 1.5 million years.

Living around 6 million years ago, in the Tugen hills region of central Kenya, this species, named Orrorin tugenensis, had small teeth with thick enamel similar to modern humans. It climbed trees, but also probably walked upright with two legs on the ground.