in self play. Absent in bonobos of Wamba. See videos. slap-stamp Goodall: Slapping with hands and stamping with feet together. Plooijs Slap stamp. Element of charging display. Absent in bonobos of Wamba. 5. See video. slap wall Slap wall of metal house with one or both hands or alternate hands, while standing bipedal or quadrupedal. Done regularly by M group adult males at Mahale and by Kasakela males at Gombe. See also slap buttress or tree trunk and drum. See video. See also video slap buttress or tree trunk. sleep Lie or sit immobile with closed eyes, unconscious. See video. slide down boulder Youngsters occasionally slide supine or prone down large slanted boulder. 8. See video. slide down vertically Goodall Fireman slide: A chimp may slide down a