Barn Swallows (IMAGE) University of Colorado at Boulder Caption A new University of Colorado at Boulder study led by Assistant Professor Rebecca Safran, shown here, indicates barn swallows that maintain a positive level of antioxidants outperform their peers in reproduction. Credit Kevin Stearns 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.