Reproduction
Northern white-cheeked gibbons are monogamous, with long-lasting pair bonds. The ovarian cycle has been reported to last an average of 22 days, and gestation lasts 200 to 212 days.
At birth, both sexes are covered in yellow-buff fur, and weigh an average of 480 grams (17 oz). At around one year of age, the fur in both sexes changes to a black colour, with pale cheek patches, with the sexually dimorphic adult coats only growing when they reach four or five years. During this period, the juveniles sing the female form of call, and regularly engage in play behaviour.
Northern white-cheeked gibbons reach sexual maturity at seven or eight years, and have lived for at least 28 years in the wild.
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