grin-low-closed grin-low-open hoot face play face play face, full play face, half pout protrude tongue pucker cheek relaxed face sneer 3-3. Expressive behavior: Gesture beat chest bend and release bend and stretch knee bend away bob bob bipedal bow clap hand clip leaf by hand clip leaf by mouth dab extend extend hand extend hand and put knuckle on ground extend hand to beg 22 Catalogue extend hand to hold tree extend hand, palm downward extend hand, palm sideways extend hand, palm upward extend leg fall over backward flap hit ground with fist hit toward lower arm lower head lower leg make sound offer arm open thighs pull through in courtship raise and hold leg raise arm bipedal raise arm quickly raise arm slowly raise arm to hold