Black-Throated Blue Warbler (IMAGE) Dartmouth College Caption A Dartmouth-led study finds that the black-throated blue warbler, a common migratory songbird, has a natural flexibility in its breeding time that has helped stave off the impact of climate warming on its food availability, at least for now. Credit Trisha Shears Usage Restrictions Credit Trisha Shears 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.