roughly horizontally towards a fellow. The arm is in a position about midway between pronation and supination. The hand may be bent at the wrist so that its back is turned to the extend hand and put knuckle on ground 73 partner with the fingers bent or fully stretched Goodalls Extend hand limited to gesture with wrist and fingers extended and palm up or down. Goodall described varying contexts in begging, as reassurance to out-of-reach subordinate, and when submissive chimpanzee seeks reassurance after aggression, or solicits support from third party. In mother-infant interactions, extend hand is contact-seeking. For bonobos, extend hand seen only as extend hand, palm downward or extend hand, palm upward below in food begging or mother seeking contact with offspring. See video. See also video