Fig 1 (IMAGE) University of Bristol Caption Image of a T. rex skeletal cast at Senckenberg Museum Frankfurt, Germany. T. rex lived at the end of the Cretaceous (about 66 million years ago) and was exclusive to western North America. Credit Kai R. Caspar Usage Restrictions Once with release 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.