Warbler (IMAGE) Cornell University Caption Users helped train Merlin to recognize 400 bird species, including the Blackburnian warbler shown here, by clicking on parts of the birds to provide information to the computer. Credit Cornell University 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.