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Palm oil plantations 'threaten Indonesia's orangutans'

27 December 2011 Last updated at 04:15 GMT

Orangutans are believed to be increasingly under threat from palm oil plantations in Indonesia.

A recent survey found that between 2008 and 2009, more than 750 orangutans were killed by Indonesian villagers working near or on palm oil plantations.

Karishma Vaswani reports from East Kalimantan.