image: Spangled contingas were one of 977 species analyzed by Dunn et al. in a worldwide survey of bird coloration. This material relates to a paper that appeared in the 27 March 2015, issue of Science, published by AAAS. The paper, by P.O. Dunn at University of Wisconsin-Milwaukee in Milwaukee, WI, and colleagues was titled, 'Natural and sexual selection act on different axes of variation in avian plumage color.' view more
Credit: Peter Dunn