Leonardo the Dinosaur (IMAGE) University of Colorado at Boulder Caption An artist's conception of Leonardo, a duck-billed dinosaur known as a brachylophosaur excavated in Montana, as it may have looked shortly after its death. Credit Artwork courtesy Greg Wenzel Usage Restrictions None 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.