In physical features they in many respects resemble the Andamanese. Their hair is short, universally woolly and black, the skin colour dark chocolate brown approximating to glossy black[349], sometimes with a reddish tinge[350]. There is very little evidence for the stature but the 17 males measured by Annandale and Robinson[351] averaged 1.52 m. (5 ft. 0-1/4 in.). The average cephalic index is about 78 to 79, extremes ranging from 74 to 84. The face is round, the forehead rounded, narrow and projecting, or as it were "swollen." The nose is short and flattened, with remarkable breadth and distended nostrils. The nasal index of five adult males was 101.2[352]. The cheekbones are broad and the jaws often protrude slightly; the lips are as a rule thick. Martin remarks that characteristic both of Semang and Sakai[353] is the great thickening of the integumental part of the upper lip, the whole mouth region projecting from the lower edge of the nose. This convexity occurs in 79 per cent., and is well shown in his photographs[354]. Hugh Clifford, who has been intimately associated with the "Orang-utan" (Wild-men) as the Malays often call them, describes those of the Plus River valley as "like African Negroes seen through the reverse end of a field-glass. They are sooty-black in colour; their hair is short and woolly, clinging to the scalp in little crisp curls; their noses are flat, their lips protrude, and their features are those of the pure negroid type. They are sturdily built and well set upon their legs, but in stature little better than dwarfs. They live by hunting, and have no permanent dwellings, camping in little family groups wherever, for the moment, game is most plentiful[355]." Their shelters--huts they cannot be called--are exactly like the frailest of the Andamanese, mere lean-to's of matted palm-leaves crazily propped on rough uprights; clothes they have next to none, and their food is chiefly yams and other jungle roots, fish from the stream, and sun-dried monkey, venison and other game, this term having an elastic meaning. Salt, being rarely obtainable, is a great luxury, as amongst almost all wild tribes. They are a nomadic people living by collecting and hunting; the wilder ones will often not remain longer than three days in one place. Very few have taken to agriculture. They make use of bamboo rafts for drifting down stream but have no canoes. All men are on an equal footing, but each tribe has a head, who exercises authority. Division of labour is fairly even between men and women. The men hunt, and the women build the shelters and cook the food. They are strictly monogamous and faithful.