IUCN: Data Deficient

• Adult males are black with white cheeks, while females are a golden or buff colour. 
• Infants are born a whitish buff colour, turning black when they are about a year old. Male babies will stay black for the rest of their lives, but females will turn golden again at about six - eight years when they reach maturity.
• Gibbons live in monogamous pairs with their offspring in cohesive family groups.
• Gibbons are smallest of the ape family, which includes orang-utans, gorillas and chimpanzees.           
• White cheeked gibbons are the most active of all gibbons. They move faster, more quietly, and farther each day than any other forest ape or monkey. Brachiation (swinging arm over arm) comprises 90% of their activity.
• They can easily leap a gap of 30 feet between one tree and another, but because they can not swim, they avoid crossing open water. Their remarkable agility makes a healthy adult gibbon virtually untouchable by most threats  other than man.
• Their fur is extremely dense, providing protection from the rain. One square centimetre of skin has over 2,000 individual hairs compared to 900 hairs per sq. cm. for Old World monkeys.
• Gibbons are known for their early-morning singing, which maintains pair bonds and excludes neighbouring family groups from the family territory. These duets consist of eerie howls and siren-like crescendos and can be heard from all around the zoo and neighbouring suburbs.