Hylobates hoolock, Harlan, 1834, Chindwin River, Burma. Two subspecies east (H. h. leuconedys) and west (H. h. hoolock).
OTHER COMMON NAMES
English: White-browed gibbon; French: Hoolock; German: Hulock; Spanish: Gibon hulock.
Female size 19 in (48.3 cm); male weight 15.2 lb (6.9 kg); female 15.4 lb (6.1 kg). Sexually dichromatic: male is black with white eyebrows (flicked up laterally); female is golden, darker on cheeks and chest, whitish eyebrows; neonate is white to gray; juveniles of both sexes are black.
India (northeast states) east and south of Brahmaputra River, Bangladesh, and Myanmar (Burma) east to Salween River.
Tropical semi-evergreen and evergreen rainforest.
Population density 1.7 groups/2.5 mi2 (km2); home range 94 ac (38 ha), 86% defended as territory 77 ac (31 ha); day range 0.8 mi (1.3 km). Notes in songs are diphasic, variable accelerating in both sexes; female great call, 19 notes, about 15 seconds duration.
FEEDING ECOLOGY AND DIET
Their diet is mainly figs and other fruit, also flowers, leaves, and animal matter.
Monogamous. Mate early in the day, probably seasonal, produce single young every two to three years.
Endangered. Relatively tame because humans work in the forest fragments.
SIGNIFICANCE TO HUMANS Usually respected. ♦
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