Young Tyrannosaur Skull (IMAGE) Ohio University Caption Skull of a 2-year-old juvenile Tarbosaurus, a Cretaceous tyrannosaur from Mongolia, with an adult skull at right and a teenage skull behind for comparison. Credit Courtesy of WitmerLab at Ohio University. Usage Restrictions Embargoed until 3 p.m. EDT Monday, May 9, 2011. Please credit source. 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.