Silverback display (IMAGE) Dian Fossey Gorilla Fund International Caption Chest beat displays are often used by silverback gorillas during fights. Credit Dian Fossey Gorilla Fund Usage Restrictions Image may be used to illustrate this story. 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.