Fossil Babysitter? (image) University of Pennsylvania Caption A rock slab dating to the Cretaceous contains the remains of 24 very young psittacosaurs and an older individual. The close association of all of the fossils could mean that this was a dinosaur nest overseen by an older 'babysitter.' Credit University of Pennsylvania Usage Restrictions In context of reporting 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.