Tianyuan Cave (IMAGE) Max-Planck-Gesellschaft Caption Researchers carrying out excavation works at the Tianyuan Cave from which the leg bones had been excavated in 2003. Credit Institute of Vertebrate Paleontology and Paleoanthropology, Beijing 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.