berniedup - FLickr - CC BY-SA 2.0
The Bornean orangutan differs in appearance from the Sumatran orangutan, with a broader face and shorter beard and also slightly darker in color. Three subspecies are recognized, each localized to different parts of the island:
Northwest Bornean orangutans are the most threatened subspecies. Its habitat has been seriously affected by logging and hunting, and a mere 1,500 individuals or so remain. Many habitat patches in the area are small and fragmented.
Northeast Bornean orangutans are the smallest in size and found in Sabah and eastern Kalimantan as far as the Mahakam River.
Central Bornean orangutans are the subspecies with the most animals, with at least 35,000 individuals.
Young orangutans are in demand for a flourishing pet trade, with each animal fetching several hundred dollars in city markets on nearby islands. Studies have indicated that 200-500 orangutans from Indonesian Borneo alone enter the pet trade each year. This represents a real threat to wild orangutan populations as orangutans have an extremely low reproductive rate. There is also trade in orangutan parts in Kalimantan, with orangutan skulls fetching up to $70 in towns.
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