Two baby orangutans found in Kutai National Park after being abandoned by their mother are being taught the skills they will need for life in the wild.

The brothers, three-year-old Dami and 10-month-old Rizki, were in critical condition when they were found. Surabaya Zoo keepers and the Centre for Orangutan Protection have since been nursing them back to health, treating them for malnourishment and injuries.

Orangutans have the longest childhood of any animal (apart from humans), often staying with their mothers until they are six or seven years old. They are completely dependent on their mothers for the first two years of their lives, and are only weaned at about five years old or when their mother gets pregnant again.

Surabaya Zoo is working to improve its standards of care. Hundreds of animals have died in the last four years, prompting an international campaign to shut it down.

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Damai and Rizki huddle together at the zoo. The orangutan has the longest childhood of any animal (apart from humans), often staying with their mothers until they are six or seven years oldGetty
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Rizki, the 10-month-old orphaned orangutan, starts learning to eat solid food. Orangutans in the wild are completely dependent on their mothers for the first two years of their lives, and are only weaned at about five years old or when their mother gets pregnant againGetty
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Rizki eats some leaves at Surabaya ZooGetty
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Rizki must learn to look after himself at 10 months old. In the wild, Bornean orangutans rarely leave their mothers' sides during the first two years of their livesGetty
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Damai, a three-year-old Bornean orangutan, waits to leave Surabaya ZooGetty
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A keeper bottle-feeds Damai, while Rizki clambers on himGetty
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The younger orangutan plays at the zooGetty
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