Western Lowland Gorilla Silverback (IMAGE) Wildlife Conservation Society Caption A western lowland gorilla silverback among members of a group. Credit Thomas Breuer/Wildlife Conservation Society-Max Planck Institute for Evolutionary Anthropology. Usage Restrictions One time usage only. Must be used with photo credit. 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.