See video. groin pocket See transport in groin pocket or hold object in groin pocket. groom Goodall Grooming behavior: use both hands, pushing the hair back with the thumb or index finger of one hand and holding it back while picking at the exposed skin with the nail of the thumb or index finger of the other. The chimpanzee can also use one hand, parting the hair in the same way and holding it back with the lower lip. Grooming may occur in bipedal, quadrupedal, sitting, or reclining posture. Grooming functions include appeasement, reassurance, reconciliation, and hygiene. See video. groom-branch-clasp Groom mutually like groom-hand-clasp, but non-grooming hand is not clasped, but held overhead on branch. Seen at Gombe and Mahale. Whiten et al.s Branch-clasp. Also recorded for bonobos