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.