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![]() | Hawkes, Kristen | Mortality and fertility rates in humans and chimpanzees: how within-species variation complicates cross-species comparisons | A grandmother hypothesis may explain why humans evolved greater longevity while continuing to end female fertility at about the same age as do the other great apes. With that grandmother hypothesis in mind, we sought to compare age-specific mortality and fertility rates between humans and chimpanzee... | 2009-01-01 |