Head-to-Head Comparison (image) University of Chicago Share Print E-Mail Caption Skull of the parrot-beaked dinosaur, Psittacosaurus gobiensis, next to that of a living macaw. 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.