Lower Mandible (IMAGE) Max-Planck-Gesellschaft Caption This is the lower mandible of the 40,000-year-old human skeleton, found in the Tianyuan Cave near Beijing. Analyses of collagen extracted from this bone prove that this individual was a regular consumer of fish. Credit Image: Hong Shang / Chinese Academy of Sciences, 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.