Nomascus gabriellae (Thomas, 1909), Langbian, Vietnam. Probably monotypic species.
OTHER COMMON NAMES
English: Buff-cheeked gibbon, yellow-cheeked crested gibbon; German: Gelbwangen-Schopfgibbon.
Weight 12.7 lb (5.8 kg). Male, black with yellowy out-brushed cheeks, rusty brown on chest; female, pale yellow or orange-yellow, yellowish incomplete face ring, cheek hair brushed out; infants born whitish buff, changing to black until puberty (females).
Southern Vietnam and Cambodia east of the Mekong River. HABITAT
Tropical evergreen and semi-evergreen rainforest. BEHAVIOR
Male emits staccato and multi-modulated phrases, no booms, soft and irregular; female great call of rapid rising notes, 11 notes, 13 seconds, terminating with male coda.
FEEDING ECOLOGY AND DIET Nothing is known.
Monogamous. Single young produced every three years or so.
Indigenous people revere and fear them. Elsewhere, there is trade in live animals, often for food or to make medicines, in particular from the bones. ♦
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