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John Mac Kinnon, a young English naturalist studying the orangutan, visited the tropical forests of the islands of Kalimantan and Sumatra, where he observed the behavior of animals in their natural habitats. For a long time, alone, the scientist followed groups of orangutans, making multi-day trips to the sparsely populated areas of Indonesia and Malaysia. Translated from: In search of the Red Ape. London, 1974.