Choco Toucan (IMAGE) University of Wisconsin - Milwaukee Caption UWM biologist Peter Dunn and his research partners studied the evolution of bright colors in birds, such as this Choco toucan, in a worldwide survey of 977 species. Male and female toucans are colored identically. Credit Photos by Peter Dunn Usage Restrictions None License Licensed 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.