Trachypithecus cristatus (Raffles, 1821), Sumatra, Indonesia. Originally included in the genus Presbytis as the species Pres-bytis cristata. Two subspecies can be recognized.
OTHER COMMON NAMES
English: Silvery lutung, silvered langur; German: Haubenlangur. PHYSICAL CHARACTERISTICS
Fur brownish gray to black dorsally and pale gray ventrally. A silvery appearance results from the fact that the hairs on the back have gray or yellowish tips. There is a crest of long hairs down the midline of the head, although its prominence differs between the two subspecies. There is mild sexual dimorphism in body size. Head and body length: 22 in (55.5 cm) for males and 20 in (50.5 cm) for females; tail length: 29.5 in (73.5 cm) for males and 28 in (70.0 cm) for females. Body mass: 14 lb 9 oz (6.61 kg) for males and 12 lb 11 oz (5.76 kg) for females.
Widely distributed in Southeast Asia, occurring along the west coast of the Malayan peninsula as well as on Borneo, Sumatra, the Natuna Islands, Bangka, Belitung, and various islands in the Riau Archipelago.
Occurs in a wide range of forest types, including primary and secondary rainforest, gallery forest and mangrove forest.
Diurnal and arboreal. Live in one-male groups. There is no clear-cut territorial behavior. All males and some females migrate from their natal groups on reaching maturity.
FEEDING ECOLOGY AND DIET
Diet consists predominantly of leaves, supplemented by shoots and fruits. Food items are taken from a wide range of tree species.
Polygynous. Typically gives birth to a single infant. The infant is bright orange in color for the first 3 months of life and is passed among, and carried by, adult females other than the mother. The species has rarely been kept in captivity, so basic reproductive features such as the gestation period remain unknown.
SIGNIFICANCE TO HUMANS
Often found in plantations. Frequently hunted for bushmeat. ♦
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