The Scientist Staff | Jan 8, 1989 | 2 min read
Francisco J. Ayala Department of Ecology and Evolutionary Biology University of California, Irvine Irvine, Calif. " The pelvis of Lucy, a three-million-year-old hominid, reveals that she was already quite adept at walking upright. Bipedality evolved very early in human evolution because it enabled males to nurture a family: It freed their hands to carry food. C.O. Lovejoy, "Evolution of human walking," Scientific American, 259 (5), 118-25, November 1988. " The oldest fossil record of terres