up lip Evert upper lip over muzzle, exposing upper gums and teeth for grooming. Cf. flip lip. 8. See video. twist When flesh difficult to detach by pulling from carcass possessed by another, wrench bone so that piece of carcass is detached. Mentioned in Boesch, but not in Goodall. 3. See video. T U Ugalla Study area of Pan troglodytes schweinfurthii in Tongwe East Forest Reserve, Tanzania. Research organized by J. Moore from 1985 to present. Also, Research conducted by T. Kano, H. Ogawa and G. Idani from 1991 to present. Another current research by A. Hernandez, A. Piel, and F. Stewart. Pioneer studies done by J. Itani and T. Kano in 19 19 7 and T. Nishida in 1975. unit group Social unit of chimpanzees, also called