Tree Swallow (IMAGE) Max-Planck-Gesellschaft Caption Early breeding birds of the species run the risk of losing their chicks because of increased risk of poor weather conditions. Credit MPI of Animal Behavior/ Shipley Usage Restrictions Usage permitted only in connection with the press release 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.