Birds and Alligators (AUDIO) University of Missouri-Columbia Your browser does not support the audio element. Caption Casey Holliday explains why birds and alligators were used in the study and their relationships to dinosaurs. Credit University of Missouri 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.