Gorillas (image) Max Planck Institute for Evolutionary Anthropology Share Print E-Mail Caption Silverback chest beating during an inter-group interaction. Credit Dian Fossey Gorilla Fund Usage Restrictions The image may only be used with appropriate caption and credit. 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.