T rex Skull with Jordan Mallon (IMAGE) Canadian Museum of Nature Caption Dr. Jordan Mallon beside the cast of a T.rex skull in the collections of the Canadian Museum of Nature. The source specimen is from a T-rex skeleton in the American Museum of Natural History. Credit Diego Steed, Canadian Museum of Nature. Usage Restrictions For use with the paper - Estimation of maximum body size in fossil species: A case study using Tyrannosaurus rex. 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.