Lewis, an Adult Chimpanzee (IMAGE) University of Pennsylvania School of Medicine Caption This is a photo of Lewis, an adult chimpanzee from Goualougo Triangle in the Republic of Congo. Credit David Morgan and Crickette Sanz Usage Restrictions Please use the credit line. 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.