Hainan Crested Gibbon

The Hainan crested gibbon is endemic to Hainan Island. Adult males are black, while adult females are golden-yellow with a dark crown patch. Like other gibbons it has extremely long arms and no tail, adaptations for rapid arm-swinging through the canopy. (Wikipedia, general species account)

It inhabits tropical montane rainforest and lives in social groups containing breeding adults and offspring. Fruit forms most of the diet, with leaves and flowers also eaten. Groups advertise their presence through loud morning songs involving distinct male and female phrases. (Wikipedia, general species account)