When closely related species mate, their offspring sometimes survive but cannot reproduce. This pattern often affects males ...

Water striders are the only insect that live entirely on the ocean’s surface. By some estimates, insects make up 80 percent of named animal species. They’re found all over the world and in all manner ...

Most people know only two things about the appendix: You don’t need it – and if it bursts, you need surgery fast. That basic ...

The tiny Amazon molly (Poecilia formosa) has always fascinated researchers because, according to the rules of evolution, it shouldn't have survived as a species, let alone thrive as a species for over ...

The Amazon molly reproduces without sex. A genomic copy-and-paste trick called gene conversion may explain how it avoids evolutionary meltdown.

Wolves living inside the Chernobyl Exclusion Zone show genetic and immune-system signals that researchers say may be linked ...

Have you ever heard two or more women say they’re on the same cycle? This is a common claim among women who live together, for example in a family or as housemates. This idea that people menstruate, ...

A thin band of light from Cristian Lucanas's headlamp pierces the blackness of a Philippine rainforest as he digs through the ...

Evolution is perhaps the most extraordinary story ever told—a tale spanning billions of years that connects every living thing on Earth through an intricate ...

The Gaia telescope spotted more than 6,000 sunlike stars, all of which appear to have migrated from the galaxy's center more ...

A trumpet-shaped, single-celled organism seems able to predict one thing will follow another, hinting that such associative learning emerged long before multicellular nervous systems ...