Northern White-Cheeked Gibbon

• Common Names: Northern White-cheeked Crested Gibbon or White-cheeked Gibbon
• Taxonomy Classification Year: 1840
• Monkey Size: 45 to 63 cm (17.72 to 24.80 in)
• Skin Color(s): Black or reddish-tan
• Habitat: Forest, rainforest
• Diet: Omnivorous
• Native Countries: Laos, Vietnam, China

The northern white-cheeked gibbon^[1] (Nomascus leucogenys), also called the white-cheeked gibbon, is an endangered species of gibbon endemic to Southeast Asia.

• Northern white-cheeked gibbons are sexually dimorphic, with males and females having different colorations and the former slightly larger.
• Males have all black fur except for distinctive white cheek patches, a prominent tuft of fur on the crown, and a throat pouch.
• Females are reddish brown, without a cranial plume, and with a crest of black or dark brown fur running from the crown to the nape.
• The species resembles the southern white-cheeked gibbon but slightly has longer hair and different vocalizations.

• Like other members of its genus, both males and females have unusually long arms, even for gibbons, with arms 1.2 to 1.4 times the length of their legs.
• Adults have been shown to exhibit a hand preference when swinging through trees, and individuals are equally likely to be right-handed or left-handed.
• Both males and females have been reported to produce reddish-brown secretions from glands around the upper chest, ankles, and hips.
• They are diurnal and spend the night sleeping on high branches, often cuddling one another tightly.
• Northern white-cheeked gibbons use vocalizations throughout the day to signal their territory and are used in mating rituals.