This is also true for the differences between men and women concerning sexual orientation Which animal mates like humans Here, we analyzed adult life expectancy in 528 mammal and 648 bird species in zoos
Biological sex is binary, even though there is a rainbow of sex roles
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.
