Tuatara -- a 'Living Fossil' (IMAGE) University of Bristol Caption The living tuatara tracks back to the Triassic, over 200 million years ago, and shows little change from that time. Credit Tom Stubbs/ University of Bristol 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.