Great Apes' Heel-Down Posture (IMAGE) U.S. National Science Foundation Caption Great apes' heel-down posture helps support their body weight as they stand, walk and run. Credit Wikimedia Commons Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.