Chimpanzees in the Goualogo Triangle (IMAGE) Lincoln Park Zoo Caption A chimpanzee rests in the canopy of the Goualogo Triangle in the Republic of Congo. Researchers from Lincoln Park Zoo in Chicago have been conducting a 20+ year study to understand and conserve the western lowland gorilla and chimpanzee populations. Credit Sharon Dewar Usage Restrictions Use only with credit to Lincoln Park Zoo. 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.