Man's Earliest Ancestors (IMAGE) University of Portsmouth Caption This is a reconstruction of the small, rat-like creatures that lived 145 million years ago in the shadow of the dinosaurs. Credit Dr Mark Witton, palaeo-artist, University of Portsmouth 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.