Lip flip: The upper lip is rolled up and back towards the nose. Usually relaxed situation Plooijs FLI. Function of everted lip facial expression unknown, but may reflect boredom. Absent in bonobos. 5. See video. flop Lie supine and kick, rake, and wriggle on ground in pile of dry leaves, like flopping fish on line. Solo play of juvenile male, Xmas, perhaps idiosyncratic to him. See video. fluid-dip See dip fluid. fly whisk See whisk fly with leafy stick. fold leaf Tonooka Leaf-folding: Tear leaf or leaves with hand or mouth, stuff into mouth, chew them repeatedly, take them out of mouth and hold between index and middle fingers, soak them in water in hollow, pick up and suck water from them. Final shape is not like sponge,