Bukit Tigapuluh, known as "30 Hills" is one of the last lowland rainforests in Sumatra with an astonishing level of biodiversity. The region is home to tigers, elephants, tapirs and orangutans. But the forest cover is declining as the paper- and palm oil industry booms. The ecosystem is under pressure and with it the habitat of the animals. In just two decades, the population of orangutans has halved with just around 6,000 primates left in Sumatra. The Zoological Society of Frankfurt (ZGF) runs a release center where around 200 orangutans are being trained for a life in the wild. The school is hard work since the animals have never learned how to hunt for food or climb a tree.
A film by Inga Sieg