Rare fossil 1a (with insets) (IMAGE) Canadian Museum of Nature Caption Fossil showing the entangled skeletons of Psittacosaurus (dinosaur) and Repenomamus (mammal), with magnified sections showing the mammal biting the dinosaur's ribs, and gripping its prey. Scale bar equals 10 cm. Credit Gang Han Usage Restrictions For use 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.