Aggressive Male Chimpanzee (IMAGE) Arizona State University Caption This image depicts an aggressive male chimpanzee. Credit Ian C. Gilby Usage Restrictions This image may be reused with permission to illustrate coverage of this article. 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.