5_Ichthyosaur_ammonites (IMAGE) Natural History Museum of Los Angeles County Caption An ichthyosaur fossil surrounded by the shells of ammonites, the food source that possibly fueled their growth to huge. Credit Photo by Georg Oleschinski, courtesy of the University of Bonn, Germany. Usage Restrictions use with credit 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.