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. 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.