Chimpanzees when faced with an out-group (IMAGE) Kyoto University Caption After hearing vocalizations from the out-group, chimpanzees became more spatially cohesive and groomed one another more often Credit Etsuko Nogami/KyotoU Kumamoto Sanctuary Usage Restrictions Credit accordingly 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.