Eastern double-collared sunbird (IMAGE) University of California - Berkeley Caption An eastern double-collared sunbird, one of six nearly identical lineages that inhabit sky islands in East Africa. Though these lineages have been separated for hundreds of thousands of years, some of their songs are as unchanged as their plumage. Credit Photo courtesy of Jackie Childers Usage Restrictions none License Original 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.