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At least 1000 orangutans have been killed in fierce forest fires in Indonesia, hastening the species' headlong rush to extinction within the next decade.
Conservationists believe many of the fires, the worst in a decade and at their peak last month, were deliberately lit to make room for
plantations to grow palm oil - much of it, ironically, to meet the world's growing demand for environmentally friendly fuel.
Their greatest victim is the orangutan - Asia's only great ape - which is so endangered that many experts believe it will become extinct in the wild over the next 10 years.
Some 50,000 of them, at most, still survive, and about 5000 are thought to perish every year as the rainforests on which they depend are felled.
Originally around 300,000 of the apes lived throughout Southeast Asia. But now they survive only in isolated pockets on the islands of Borneo and Sumatra.
In the past 20 years, 80 per cent of their habitat has been destroyed - and only about 2 per cent of what remains is legally protected in reserves.
"Orangutans are in catastrophic decline and everything that is being done to protect them is not up to the challenge," said Ian Redmond, chairman of the Ape Alliance, an international coalition of conservation bodies and an adviser to the United Nations Environment Programme. "It is all looking pretty bleak."
The International Fund for Animal Welfare predicts that they will be extinct within 10 years. Other estimates vary either side of that figure. WWF (formerly the World Wildlife Fund) puts it at 20 years, Friends of the Earth at 12, and the Borneo Orangutan Survival Foundation at just four.
The apes - whose name means "man of the forest" - are one of our closest relatives, sharing about 97 per cent of our DNA. Spending most of their time in the treetops, they mainly live on their own. Mothers keep their babies with them for up to six years, and have a single baby every eight years or so. This leisurely rate of reproduction - the slowest of all the great apes - makes the species particularly vulnerable.
They have long been threatened by the pet trade: the number of the apes per square kilometre in Taiwan's capital, Taipei, is now greater than in their natural rainforest homes. For every one that is sold as a pet, five or six are thought to die. They are also killed for meat.
But it is the destruction of the rainforest - which used to cover the whole of Borneo - that is much the greatest threat. It has long been cleared for logging and agriculture, but this has accelerated to meet the booming demand for palm oil.
Orangutan
A threatened tree-dwelling ape, orangutan means "man of the forest" in the Malay language.
Males make long, loud calls that carry up to 1km to stake out territory and attract females.
The orangutan Clyde was Clint Eastwood's pet sidekick in the film Every Which Way But Loose and its sequel Any Which Way You Can.
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