Maiasaura (IMAGE) Field Museum Caption Maiasaura, one of the dinosaurs analyzed in the study, was estimated to have substantial variation in adult sizes, possibly indicating males and females, with relatively low uncertainty compared to other species. Credit Illustration by James Ormiston Usage Restrictions Please include credit 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.