peter: our main aim is to protect lowland rainforest. e orangutan is like our poster child, the ambassador of the rainforest if you will. and if we don't protect it, we will lose the orangutan. 80% of sumatra's rainforest has disappeared over the last 50 years. that means the orangutans' natural habitat is disappearing. none of them could survive in an oil palm or acacia plantation. these monocultures are completely different from their natural habitat. that's why it's so important that we preserve the remaining 20% of the rainforest. reporter: the focus now is on preserving the protected areas that already exist. it's too late for anything else. amoy has also found a new home in the bukit tigapuluh national park, where she's now living in the wild. all the orangutans in this nature reserve were born in captivity -- each one with its own story. rimbani has lived in the wild for years. ow off her young son radja. peter: when you observe an orangutan, you often see behaviors that are typical of human beings. you can really see that we're cl