Parrots with a Prosocial Attitude (IMAGE) Max-Planck-Gesellschaft Caption In the behavioral experiments, the parrots receive metal tags, which they can then exchange for food. Credit Comparative Cognition Group 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.