<em>Castorocauda</em> (IMAGE) Society of Vertebrate Paleontology Caption Castorocauda -- a mammal that may have swam using its beaver-like tail -- is shown preserved here with 'scale-like' skin. Credit Society of Vertebrate Paleontology 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.