Barn swallow bird (IMAGE) University of California - Davis Caption Barn swallows were considered a "gold-star bird" for benefiting farms in a study from UC Davis. Credit Elissa Olimpi, UC Davis Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.