Her resume continued to grow. Breed set a world record as the fastest woman to swim the length of Lake Tahoe, finishing the nearly nine-hour crossing in frigid water. She also became the first person ...

Beluga whales avoid inbreeding by switching partners over time, helping a small, isolated population stay genetically healthy ...

The sun was still low on the horizon when 19-year-old Piper James walked toward the Pacific Ocean for a morning swim on an island whose name in the local language means “paradise.” ...

The best dog boots for winter protect paws from snow, salt, ice, and cold. Our picks include waterproof boots from Ruffwear, ...

From cat breeding chaos to tactical combat, we dig into the ideas shaping one of the most ambitious roguelikes of the year.

Researchers in Alaska have discovered that beluga whales have lots of different partners and this “mate switching” could be vital for helping populations survive.

A new study suggests humans belong in an elite “league of monogamy,” ranking closer to beavers and meerkats than to chimpanzees. By comparing full and half siblings across species and human cultures, ...

A new study shows penguins are breeding earlier than ever in the Antarctic Peninsula. This region is one of the fastest-warming areas of the world due to climate change, and penguins time their ...

You'd think we'd know everything there is to know about sexual reproduction. But as it turns out, there are still quite a few ...

Long before Western astrology, the Chinese zodiac helped organize years, beliefs, and social life. Here’s how the system of 12 animals evolved over the centuries.

A partial skeleton dating back more than two million years is the most complete yet of Homo habilis, one of the earliest ...

For instance, it has been argued that as the modern human Y chromosome replaced the Neanderthal equivalent, Neanderthal males became sterile. Other research suggests that human genes might have messed ...