Barn Swallows (IMAGE) University of Colorado at Boulder Caption CU Boulder Associate Professor Rebecca Safran is shown here netting barn swallows in Boulder County, Colorado for evolution study. Credit University of Colorado 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.