Fossils

http://news.nationalgeographic.com/news/2009/10/091001-oldest-human-skeleton-ardi-missing-link-chimps-ardipithecus-ramidus.html
This article was about the discovery of the oldest fossil skeleton of the human ancestor. It lived over a million years before "Lucy" and is called the Ardipithecus ramisdus or "Ardi." Ardi's fossil was dicovered in Ethiopia's Afar desert 46 miles from where Lucy's species lived. Ardi shows that the chimpanzee and human link may not be the root of the family tree for human ancestors. Instead Owen Lovejoy who analyzed the bones said, "...there was this vast intermediate stage in our evolution that nobody knew about. It changes everything." Ardi's bone structure infers that she wasn't a bipedal walker like most early hominids, instead her species were bipeds on the ground and quadrapeds in the trees.