Songbirds Sing Species-Specific Songs (IMAGE) PLOS Caption Zebra finch (left), owl finch (right), and their hybrid (intermediate). Credit Kazuhiro Wada Usage Restrictions CC-BY: Redistribution allowed with credit 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.