Savannah Sparrow Wintering (IMAGE) University of Guelph Caption The number of songbirds breeding during spring and summer depends mostly on what happens at their wintering grounds. Credit Stéphanie Doucet Usage Restrictions For use only with stories related to this research study 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.