Eurasian reed warbler (IMAGE) Bangor University Caption A Eurasian reed warbler used in the study and then released. Credit Florian Packmor Usage Restrictions For single use with this story only. 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.