older infant leaps down from mothers back, runs ahead, climbs shrub or fallen log, waits for her arrival, then leaps on her back, and resumes ride. Infant play, repeated again and again. 7. L leap into lap Goodall: An infant jumps into the lap of a sitting chimp, during greeting. Seen at Mahale, but not in greeting. leap on Spring onto another in play and aggression. Infant may leap from mothers back to older playmates back in traveling. Kanos Jump on similar for bonobos, but jumper likely to mount. See video. leap quadrupedal Usual way of crossing stream via stepping stones. Before leaping, chimpanzees swing body back and forth to gain momentum in quadrupedal posture. Cf. hop quadrupedal on spot. Bonobos commonly leap on all fours arboreally and