Across 1,000 species, males die younger than females—even in zoos. A global study shows biology, not just lifestyle, drives ...

It isn’t just snakes that fill up the reptilian quota of egg-laying animals. A group of reptiles — known as squamates — comprised of lizards, turtles, crocodilians, and snakes, are all overwhelmingly ...

Sexual behavior is one reason why female mammals typically live longer than their male counterparts, according to a new study ...

A global study reveals sexual selection influences life expectancy differences between sexes in mammals and birds, reshaping ...