Updated bird family tree (IMAGE) University of California - San Diego Caption The updated bird family tree, published in Nature, delineating 93 million years of evolutionary relationships between 363 bird species. Credit Jon Fjeldså (drawings) and Josefin Stiller Usage Restrictions Please credit: Jon Fjeldså (drawings) and Josefin Stiller 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.