Most female mammals are longer-lived than males of the same species by an average of 18.6%, but human females live only about 7.8% longer than males, researchers reported in Proceedings of the National Academy Of Sciences. Males of some species outlive females, including horses and bats, but the difference is less pronounced, and study co-author Jean-Francois Lemaitre says sex-based differences in lifespan could be due to environment and reproductive roles.
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