School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America.|Richard Gilder Graduate School and Department of Ornithology, American Museum of Natural History, New York, New York, United States of America.|Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom.|Department of Computer Science, University of California at Davis, Davis, California, United States of America.|School of Information Sciences, University of Illinois at Urbana-Champaign, Champaign, Illinois, United States of America.