mouth in stream but without drinking. Water-contact play of juvenile chimpanzees in quadruped or lying posture. See video. put rump to rump Goodall Rump-to-rump: In response to a submissive present, the higher ranking chimp turns his rump to the other and they touch bottoms. Only seen in a few males. Very rare at Mahale and in few males and females. Cf. rub genital. Common in bonobos. 8. See video. put ventral 147 put ventral Goodall Take ventral: Mother reaches to infant, grasps, and presses to a ventral position. Cf. put dorsal, scoop infant and solicit riding. Kanos Take ventral in bonobos. See video. put ventral from dorsal Mother transfers infant from dorsal to ventral position, when entering dense bush or meeting possible danger, such as unknown humans. Cf.