The Burtele Foot with its elements in the anatomical position. (Photo by Yohannes Haile-Selassie/ASU) In A Nutshell * Scientists matched a mysterious 3.4-million-year-old fossil foot discovered in Ethiopia to Australopithecus deyiremeda, a human ancestor that lived alongside Lucy’s species but retained tree-climbing abilities. * The discovery shows human evolution wasn’t a straight path from trees to ground. While Lucy’s species evolved rigid feet for walking, A. deyiremeda kept feet that could both walk and climb, plus ate different foods from forest environments. * A juvenile jaw with distinctive teeth from the same site as the foot provided the missing link....