Emergent Anvil (IMAGE) Max Planck Institute of Geoanthropology Caption Wild sea otter at Bennett Slough Culverts opening mussels using emergent anvil stone. Credit Monterey Bay Aquarium, Jessica Fujii. Haslam <em>et al</em>. 2019. Wild sea otter mussel pounding leaves archaeological traces. <em>Scientific Reports</em>. Usage Restrictions This image may only be used in the context of reporting on this publication and with appropriate credit information. 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.