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This species is found in tall primary and heavily degraded evergreen and semi-evergreen forest. In northeastern Viet Nam and northern Lao PDR, the animals live in the lowland, in a subtropical climate with a short and not very cold winter without frost, at elevations of 200?600 m (Dao Van Tien 1983). In Yunnan province, China, the species was observed at altitudes of 700?1,000 m (Hu et al. 1989). In Lao PDR, gibbons are found from the Mekong plains up to at least 1,650 m in Phou Louey National Biodiversity Conservation Area (Duckworth et al. 1999).

Gibbons are strictly arboreal and mainly frugivorous (Geissmann et al. 2000), but there is very little field data on the behavioral ecology of N. leucogenys. Dao Van Tien (1983) studied the content of the stomach of six wild-shot crested gibbons (genus Nomascus) from Viet Nam, including three N. leucogenys, and found 90?100% fruits, associated with some leaves and insects. This data cannot be directly compared to field observations, which usually measure the time spent eating various food items (Geissmann et al. 2000). Food composition in Xishuangbanna (southern Yunnan) included fruits (39%), leaves (36%), and flowers (5%) (Hu et al. 1989). During the rainy season (May?October), when many fruits are available, gibbons travel less, whereas in the dry season (November?April), the gibbons eat more leaves and travel for longer distances (Hu et al. 1989). Average group size in Yunnan province, China, was 3.78 (range 3-5, n = 9) (Hu et al. 1989). In anecdotal reports, group sizes of three gibbon groups from Thanh Hoa and Nghe An provinces (southern part of north Viet Nam) were specified as 3, 3, and 4 individuals, respectively (Nguyen Manh Ha et al.2005).

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Q: What is the population of the white cheeked gibbon?
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