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How Lurking Predators Changed the Size of the Mosquitofish's Genitals

Female mosquitofish give birth to tiny babies, like the guppies you may remember from your third-grade aquarium. That means male mosquitofish don’t spawn: if they’re going to be dads, they need to use a modified fin (called a gonopodium) to inseminate their mate. And sex with a long, stiff fin demands a daunting level… » 8/25/15 8:00am 8/25/15 8:00am

A New Option for Crocodile Birth Control 

When they live in zoos, Mugger crocodiles happily mate and lay eggs. Maybe a little too happily: when they produce two clutches of 25 to 30 eggs each year, a zoo is quickly going be swamped by little croc babies. And rampant habitat loss means that there are fewer places to return them to the wild. What zoos need is… » 8/18/15 4:20pm 8/18/15 4:20pm

9 Animals That Masturbate (Other Than Humans)

Humans didn’t invent masturbation. We get the urge because our ancestors did too, even back to the earliest mammals and reptiles. It’s likely that as soon as animals evolved brain circuitry that made stimulating sexual organs rewarding, individuals started taking the opportunity to reward themselves.
» 8/12/15 12:30pm 8/12/15 12:30pm