Ten grooms Jeudi (VIDEO)

Cell Press

Caption

This video was taken from a wild bonobos (E1 group) at Wamba in DR Congo. It shows ten (male, left; 45-years-old) grooming Jeudi (male, right; 21-years-old). When Ten changed his position because of Jeudi's movement following Ten's direction by touching Jeudi, Ten moved back to groom JD. It is probably because he cannot clearly focus on a close object because of far-sightedness (Presbyopia). As in this video, bonobos in the wild around at their age 40, need significantly further distance to focus on an object.

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Heungjin Ryu (CC BY-NC 4.0)

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