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One way that young orangutans acquire foraging skills is through a behavior scientists call peering—closely watching older orangutans as they engage in an activity that the young have not yet mastered. Since female orangutans typically remain in the same area from youth through adulthood and males do not, Beatrice Ehmann and her colleagues hypothesized that it is more advantageous for immature females than males to devote attention to orangutans who are permanent residents of the immature individual's home region, and this should be reflected in sex-specific differences in peering behavior.