Dinosaur and Macaw (image) University of Chicago Share Print E-Mail Caption The skull of Psittacosaurus gobiensis (pictured here with the skull of a modern macaw) presents the first solid evidence of nut-eating in any dinosaur. Credit Mike Hettwer Usage Restrictions News organizations may use this image in reports describing the research of Paul Sereno and his associates. Share Print E-Mail 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.