Cretaceous Ecological Food Web (image) University of Chicago Caption This illustration depicts the food web for ecological groups in the late Cretaceous Period as reported in a new paper published in the Proceedings of the National Academy of Sciences. Each ecological group includes a set of species that share the same set of potential predators and prey. Silhouettes show iconic members of each group. Arrows show who eats whom. Credit Courtesy of Jonathan Mitchell, Peter Roopnarine and Kenneth Angielczyk Usage Restrictions News organizations may use this image in connection with reports about the research of Jonathan Mitchell and his associates. 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.