A new study posits that same-sex sexual behavior developed to help primates in complex social groups ease tension, reduce ...

The missing link in the mystery turned out to be an event called the Cambrian explosion. It was only after it that living ...

Blue blood may look alien, but it’s one of evolution’s most elegant solutions to life in extreme environments. Here’s how ...

Earth’s first sponges may have been ghostly, soft-bodied pioneers—ancient animals that evolved long before their skeletons ...

A new study theorizes that evolution ticks at different speeds, especially when a big group of organisms first appears.

Once upon a time, there were a bunch of one-celled microbes, swimming, eating, reproducing, doing all the things that a one-cell bit of life can do. Then, some time later, there were their descendants ...

An artist’s impression depicts Kryoryctes at Dinosaur Cove in Australia. New research supports the hypothesis that Kryoryctes is a common ancestor of both the platypus and echidna. - Peter Schouten ...

A new study from Bar-Ilan University shows that one of sleep's core functions originated hundreds of millions of years ago in ...

Bite force, a measure of the strength of an animal's bite, helps researchers understand a species' role in the ecosystem.

Red blood is the exception, not the rule. Evolution has painted it green, purple and white in animals that push physiology ...

In five cases where vertebrates evolved monogamy, the same changes in gene expression occurred each time. In many non-monogamous species, females provide all or most of the offspring care. In ...

To understand the origins of multicelled life, researchers are studying a motley assortment of simpler animal relatives. The commonalities they’re unearthing offer a trove of clues about our mutual ...