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Sex differences in brain and behavior of animals including humans result from an interaction between biological and environmental influences Sexual behavior is one reason why female mammals typically live longer than their male counterparts, according to a new study. This is also true for the differences between men and women concerning sexual orientation

Here, we analyzed adult life expectancy in 528 mammal and 648 bird species in zoos Instead, they increased sharply around sexual maturity Like humans, 72% of mammals exhibited a female life expectancy advantage, while 68% of birds showed a male advantage, as expected from the harmful effects of sex chromosomes described by the heterogametic sex hypothesis

Yet, sex differences varied widely.

Leipzig, germany — scientists studying zoo animals have uncovered something unexpected Even when males live in safe, controlled environments with abundant food, no predators, and excellent medical care, they still die younger than females This points to biology, not just lifestyle, as the driver of sex differences in longevity. The researchers also found that, in all animals and humans, few sex differences occurred while organs were developing

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