Grey Parrot (image) Max-Planck-Gesellschaft Share Print E-Mail Caption An African grey parrot is confronted with the decision between an immediate small food reward and a token which the bird can only later exchange for high-quality food. Credit CCRG Usage Restrictions Only in context with the press release. Share Print E-Mail 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.