Scratch. Plooijs Scratch. Seen as Self-scratch in bonobos. See videos. scratch aggressively Scratch another to inflict wound. Goodalls Aggressive scratch: A chimpanzee may scratch another during a fight. Probably also in bonobos. S scratch dry leaves Scratch or rake with one or both hands dead leaves piled on ground, as initiation of pant-hooting or charging display, as solicitation of grooming, as solicitation of play, or as courtship. Done by infants as solo play. Maybe same as Goodalls Scrub or Rake. Cf. scatter dry leaves. Plooijs Rake. Bonobos rake before dragging Haumania vine in display. 5. See video. scratch self Goodall Self-scratch: Nails drawn deliberately across skin. In self-grooming, scratching is directed against the direction of hair growth and is followed by grooming of the scratched part. Goodalls Scratch