branch raise arm with elbow bent raise leg while lying rap reach wrist toward scratch dry leaves scratch self signalling shake arm, abduct shake arm, adduct shake back and forth with four limbs shake branch shake branch up and down with feet shake detached branch slap slap branch slap buttress or tree trunk slap ground slap in invitation slap self slap-stamp slap wall solicit companion solicit copulation solicit grooming solicit play solicit reassurance contact solicit riding solicit support stamp stamp bipedal stamp in invitation stamp quadrupedal strip leaf throw temper tantrum tip head 4-1. Positional behavior: Locomotion backstroke brachiate climb climb cliff climb vertical climb vertical, extended elbow crutch descend descend by brachiating descend orthograde feet first descend tree trunk feet first descend tree trunk head first drop