stout stick with foot, while holding stick with hands. Customary at Goualougo and recorded at Ndoki. Absent at Mahale. See video. P push Extend arm or foot to make forceful contact in aggression, grooming, infantile courtship, social play, and play solicitation. To groom another, push part of back, so that groomee turns torso. Groomer stimulates groomee to change posture after extensive grooming of body-part. Mother pushes infant to descend from her back to ground. Mother gives infants back or rump swift push with hand or foot to make it walk ahead. Juvenile male sometimes pushes back of estrous female to solicit copulation. Kanos and Pikas Push in bonobos. See video. push ahead Mother drops off older infant from back or belly and encourages it to go ahead by