Male Anna's Hummingbird (IMAGE) University of California - Davis Caption A male Anna's hummingbird, held by researchers studying hummingbird health. Credit Don Preisler/UC Davis Usage Restrictions Provide 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.