Three Golden-Crowned Sparrows in a Flock (IMAGE) University of California - Santa Cruz Caption Though highly territorial on their summer breeding grounds, golden-crowned sparrows form winter flocks with the same birds year after year. Credit Bruce Lyon Usage Restrictions For use only with news coverage of this research. 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.