for ants or termites, etc. See also kill time. drop branch Drop branch from overhead to threaten human observer below, sometimes hitting target. Some adult males forcibly kick dead branches, detaching them, so that they fall. Occasionally seen at Mahale when chimpanzees were not well habituated. Seen in female chimpanzee in Gabon. Ingmanson described Object dropping, e.g. branch in bonobos of Wamba. See video. drop infant Mother drops older infant when mother tired during long bout of travel. Includes shake rump, shrug, lower head and shoulder, reject-sit, push, lower rump, etc. 5. See video. See also video lower rump. drop self Release branch and let self drop to lower vegetation or ground without leaping. Common practice when leaving tree. Youngsters in play repeat sequence of climbing and dropping.