from rain, storm, danger, or social harassment. Also in bonobos, except for protection from rain. See video. protest When attacked, threatened, or stolen from, resolutely display dissatisfaction with bark, stare fixedly, scream, and chase to dominant attacker, especially if supporter present, then attacker may flee. Supporter of victim may join in or remain calm. Cf. retaliate. 3. See video. protrude tongue Small infant sticks out tongue. Function unclear. 8. See video. pucker cheek Suck in cheeks. Function unknown. 8. See video. P pull Grasp and tug at object or other by flexing arms. Often in feeding, play, grooming, or agonism. Alpha male of M group pulled estrous female unwilling to follow him. Estrous female, Ako, pulled juvenile grooming adult male so vacating place for her to copulate with