Little Foot bones show ancestors climbed trees and walked upright
Researchers studied limb-bone strength in the 3.67-million-year-old Little Foot skeleton from the Sterkfontein Caves. They report that Australopithecus climbed trees regularly and also walked on two legs. The peer-reviewed study appears in Science Advances.
Professor Kristian Carlson of the University of Southern California, affiliated with the Evolutionary Studies Institute at Wits University, worked on the study. Little Foot's arms are strong compared with its thighs, like African apes, but its lower limb is closer to the modern human pattern. Fossils from Dmanisi in Georgia, from about 1.8 million years ago, look much more like modern humans. The study infers behaviour from bone strength, so it is an interpretation, and the authors say the cause of the shift is uncertain.