Orangutan (IMAGE) Washington University in St. Louis Caption A new study by Herman Pontzer, Ph.D., assistant professor of anthropology in Arts & Sciences at Washington University in St. Louis, suggests that orangutans use less energy than even sedentary humans. Credit Wikipedia Commons Usage Restrictions None 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.