Artwork - mammal dino encounter (IMAGE) Canadian Museum of Nature Caption Life reconstruction showing Psittacosaurus (dinosaur) being attacked by Repenomamus (mammal), 125 million years ago. Credit Michael Skrepnick Usage Restrictions For use only with articles about this journal paper. License Original 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.