Solo object play. 8. See video. swagger bipedal Goodall Bipedal swagger: In an upright or semi-upright posture the chimp sways, often rhythmically, from one foot to the other. The animal may remain in one spot to swagger or move forward during the swagger. The arms are normally held out from the body, the shoulders hunched up. It is often used during aggression, greeting, and courtship. van Hooffs Sway walk. Plooijs Bipedal swagger. Nishidas Bipedal swagger. Often performed as separating intervention just before charging display. Similar behavior occurs in bonobos of Wamba. See video. swagger on knuckles Adult male, Pim, approaches estrous female in orthograde posture with knuckles on ground and penis erect. Idiosyncratic courtship display. 9. See video. swallow leaf Wrangham and Nishida Leaf-swallow. Ingest slowly and without