Playing Chimps (image) Max-Planck-Gesellschaft Share Print E-Mail Caption Playtime! While motherless chimpanzees engaged in social play more frequently than chimps that were reared by their mothers, it more often led to aggression. Credit Max Planck Institute for Psycholinguistics, Nijmegen Usage Restrictions None 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.