His book Among Orangutans: Red Apes and the Rise of Human Culture tells the story of his discovery of a group of orangutans in northern Sumatra and the challenge their tool use and sociality pose to theories of primatology and the insights they offer into key moments in human evolution.
Van Schaik proposed that the occurrence of tool use would be likely in foraging species if three factors were present: manual dexterity, intelligence, and social tolerance.
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