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Sex differences in brain and behavior of animals including humans result from an interaction between biological and environmental influences Understanding these similarities offers valuable insights into the evolution of human sexuality and social structures. This is also true for the differences between men and women concerning sexual orientation
Biological sex is binary, even though there is a rainbow of sex roles
Here, we analyzed adult life expectancy in 528 mammal and 648 bird species in zoos Which animal mates like humans 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.
A large number of morphological, physiological and behavioural traits are differentially expressed by males and females in all vertebrates including humans These sex differences, sometimes, reflect the different hormonal environment of the adults, but. Sexual behavior is one reason why female mammals typically live longer than their male counterparts, according to a new study.
