Reconstruction of <i>Xianshou songae</i> (IMAGE) American Museum of Natural History Caption This is a reconstruction of the new mammal species, Xianshou songae. This mouse-sized animal was a tree dweller in the Jurassic forests and belonged to an extinct group of Mesozoic mammals called Euharamiyida. Credit © Zhao Chuang Usage Restrictions Can only be used in stories about this <i>Nature</i> paper, with appropriate credit. 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.