pattern. Cf. rap. slap buttress or tree trunk Strike tree with hand or alternate hands during charging display. Goodalls Drum. See also drum and slap wall. Included in Kanos Drum for bonobos. See video. slap ground Strike substrate with hand or alternate hands during pant-hooting, threatening, charging display, fighting, and play. Slap ground and pant-hoot in response to pant-hoot calls from distance. Recorded from Beni. Bonobos slap ground while staring at opponent, so context more narrow. See video. See also video enter hole. slap in invitation Nishida Invitation slap. Repeatedly strike rock or ground with one or both hands, to entice youngster into play. Elements include: slap ground, play face, stand quadrupedal. Adolescent male, Cadmus, repeatedly slapped hand of adult female lying on ground with back of hand