Silvery leafmonkey

Trachypithecus cristatus

SUBFAMILY

Colobinae

TAXONOMY

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.

DISTRIBUTION

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.

HABITAT

Occurs in a wide range of forest types, including primary and secondary rainforest, gallery forest and mangrove forest.

BEHAVIOR

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.

REPRODUCTIVE BIOLOGY

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.

CONSERVATION STATUS

Not threatened.

SIGNIFICANCE TO HUMANS

Often found in plantations. Frequently hunted for bushmeat. ♦

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