to clap hands as part of threatening gesture against human observers. Only record of hand clapping by wild chimpanzees, although known in captivity. Absent at Mahale. clasp self Goodall Self-clasp: Sit or lie with arms tightly clasped around self. in a relaxed manner during resting. Not seen at Mahale, nor in bonobos of Wamba. Infants of both species of Pan in captivity show this gesture. clear nasal passage 45 clear nasal passage See probe nasal passage. climb Plooij Climb. Includes not only climb vertical and climb vertical, extended elbow, but also climbing by walk quadrupedal on palms on slanting trunk or bough of big tree. Goodalls Vertical climb and Kanos Vertical climb up for bonobos probably includes both climb vertical and climb vertical, extended elbow. See video. climb