Western Bluebirds (IMAGE) Santa Fe Institute Caption Researchers modeled the fitness benefits of helping behavior in the western bluebird (Sialia mexicana). Credit David Moldoff Usage Restrictions Use with credit to photographer 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.