Like other gibbons, Red-cheeked Gibbons are arboreal and diurnal, with singing bouts averaging 12 minutes and lower calling frequencies in the wet season (Rawson 2004, Kenyon 2007). The species displays a monogamous social structure of adult pair and offspring. Average group size is estimated at 3-5 individuals. Females emigrate near, in and around their natal territories, but males emigrate farther and wider. Female give birth to single offspring at 17-22 month intervals. Nomascus gabriellae is considered Endangeredb ased on a suspected population reduction of 50% or more due to hunting for food, live capture for the pet trade, and the loss of suitable habitat.
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