Identification:
This is a subspecies of Hylobates lar. Distinguishing characteristics include variations in fur coloration based on sex and age. Newborn males and females have gray fur. Around 4-6 years of age, black coloration appears on the face and head. Male adults (5-6 years old) have black fur with white markings around the face and eyebrows; some individuals may also have white patches on the backs of their hands and feet. Adult females resemble individuals aged 2-3 years, with yellow fur on the body and black coloration on the head and chest. Head-body length: 470-495 mm. Tail length: 140-150 mm. Weight: 4-7 kg.
Biology and Ecology:
They inhabit dense forests. Their diet consists of leaves, fruits, insects, and small animals such as bird eggs and reptiles. When drinking water, they cup water in their hands from tree hollows, lick water from leaves, or lick their own fur. They live in family groups or small social units. They typically give birth to a single offspring. The infant clings to its mother while she forages until it is about one year old. The mother mates again when the offspring is 2-3 years old. Adult gibbons are driven out of the group. Males are driven out earlier than females and live alone until they find a mate.
Distribution:
In Vietnam, they were previously recorded in Phu Quoc Island, Laos, Cambodia, and northeastern Thailand.
Value:
They are a valuable and very rare genetic resource, with conservation and behavioral ecological research value. They are also kept in zoos for display.
Status:
The current status of the Hylobates lar population in Vietnam is unknown. They are facing the risk of extinction.
Recommended Conservation Measures:
Prohibit the hunting of gibbons on Phu Quoc Island. Actively investigate and search for this species to introduce it to zoos and National Parks.