approach, follow, dance bipedal and crouch. Clip leaf, bend shrub, dance bipedal, etc. unique to Mahale. Goodalls Courtship includes display brachiation. In bonobos of Wamba, hunch bipedal, shake branch, rock, open thighs, and hunch and sit are courtship displays. See video. See also videos aggress in sexual frustration and copulate dorso-ventral. solicit grooming 175 solicit grooming van Hooff Groom-present. Goodalls Present for grooming: The rump, back, or bowed head are the most usual body parts presented to a chosen grooming partner at the start of a session. Scratch self, raise arm, sit and turn back, sit sideways, raise leg, raise arm to hold branch, raise arm slowly, lie with back to another, etc. also used. Alter position of limbs, head or body-part to facilitate continuation of grooming. Self-scratching