T. Rex (IMAGE) University of Missouri-Columbia Caption An artist's rendition of the Tyrannosaurus rex with the 3D imaging showing muscle activation in its head. Credit Illustration courtesy of Brian Engh. 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.