Artist's impression of Ajnabia (IMAGE) University of Bath Caption Duckbill dinosaurs evolved in north America, spreading to South America, Asia, Europe, and finally Africa Credit Credit: Raul Martin 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.