copulation. core area Area used intensively by individual chimpanzee although also used by other members of unit group. Females compete one another for good core area. Cf. territory. cough Goodall:When chimps have colds and coughs they sneeze and cough, sounding like humans. See sickness. Bonobos also cough. See video. cough bark Goodall: Soft bark. A grunt-like sound uttered through slightly open mouth directed by higher ranking chimpanzees to subordinates. Indicates mild annoyance. It functions as a mild threat. Threat call of one syllable. Also in bonobos. See video. cough-threat See cough bark. counter-attack See retaliate. courtship display See solicit copulation. cover breast See cover nipple. C 50 cross legs cover from rain Cover body with leafy twig to avoid rain. Present at Goualougo. Also seen for bonobos of