in threat. Also at onset of charging display. Seen also during leap bipedal. Plooijs Rock. See video. rock side to side Goodall Rock: Slight or vigorous side to side movements of the body when the chimp is sitting.Rocking occurs when a male is working up to a charging display. At Mahale, rocking prelude to charging display and when nervous. Bonobo rocking occurs only in courtship, not as warming up for charging display. See video. roll Goodall Roll: A chimpanzee may hit another and roll over him during aggression or play. Bonobos use in aggression. See video. rooting See nuzzle. R rotate fruit Juvenile male, Michio, lies supine on ground, extends legs upward and rotates big fruit such as Voacanga lutescens with his feet. Solo object play. See video.