pushing or pulling so as to travel comfortably and secure infants security. Goodall: A mother pushes her infant ahead of her during weaning to prevent dorsal travel. Often she does this with little slaps of her hand on its rump and this is apparently perceived by the infant as playful. Whether or not playful slaps is unclear at Mahale. Absent in bonobos of Wamba. 5. See video. push and pull sponge Whiten et al. Sponge push-pull. Put leaf-sponge into hole of tree and pull it out with stick. At Mahale, two juveniles used stick to pick out leaf-sponge from tree hole. Present also at Gombe and Ta. push away 145 push away Shove away infant with palmar side of hand forcibly, or back side of hand gently. Goodall