Elephant and Shark Teeth (IMAGE) California Institute of Technology Caption The Caltech-led team first tested their method for directly measuring the body temperatures of vertebrates on teeth from living animals, such as elephants and sharks. Credit Caltech/Robert Eagle Usage Restrictions With credit as given above 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.