Hoolock Gibbon (IMAGE) World Wildlife Fund Caption This is a Hoolock gibbon (Bunopithecus / Hoolock hoolock) in Itanagar, Arunachal, India, captive. Credit © naturepl.com / Axel Gebauer / WWF-Canon Usage Restrictions No Merchandising Use. Only for authorized use in the context of illustrating WWF work. Photo credit is mandatory. 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.