Ten grooms JD (IMAGE) Cell Press Caption This photo shows ten (male: 45 years old) grooming JD (male: 21 years old). He is the oldest bonobo in E1 group at Wamba in the Luo Scientific Reserve, DR Cong. He needs 40 to 45 centimeters between his figers to eyes to get pin-focus for grooming. Credit Heungjin Ryu (CC BY-NC 4.0) Usage Restrictions Credit Required. 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.