Model Food Web (IMAGE) California Academy of Sciences Caption Details of a model food web from the Dicynodon Assemblage Zone at the beginning of a mass extinction are shown. Credit © California Academy of Sciences Usage Restrictions Images available for editorial use only. Proper attribution must be displayed. 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.