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High-ranking female chimpanzee Fifi with her seventh surviving offspring Fred at Gombe National Park, Tanzania. Although dominance hierarchies are not conspicuous in chimpanzees, data from 25 years of observation show that high-ranking females have significantly higher infant survival, more rapid maturation of their daughters, and higher lifetime reproductive success than low-ranking females. See page 828 and the related Perspective on page 774. [Photo: Steve Patch, Jane Goodall Institute]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)