Play Behavior (image) National Institute for Mathematical and Biological Synthesis (NIMBioS) Share Print E-Mail Caption An adult Gelada monkey plays with a juvenile. A new special issue of Adaptive Behavior examines the evolution and origin of play via mathematical and computational approaches. Credit Elisabetta Palagi Usage Restrictions Please attribute. 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.