Three Golden-Crowned Sparrows in a Flock (image) University of California - Santa Cruz Share Print E-Mail 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. Share Print E-Mail 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.