Here are 10 animals that have some of the highest levels of testosterone and the impact it has on their behavior and characteristics.

In the kitchen of UC Davis Professor Emerita Sarah Blaffer Hrdy, overlooking a long dining table, hangs a painting by artist Isabella Kirkland.

Scientists have uncovered new clues about some of Earth’s earliest fish, shedding light on the ancient origins of vertebrates ...

Scientists discovered some of the oldest bony fish fossils in China. The fossils explain the early history of animals with backbones.

A bite-marked dinosaur bone turns up in the American South, and the damage doesn’t match any familiar predator.

By midlife, an animal's everyday behaviors can signal how long it is likely to live. That is the striking conclusion of a new study in which researchers put scores of short-lived fish under continuous ...

Sharks might not be a natural biological group, with most species potentially closer kin to rays than to an oddball group of sharks.

At the bottom of the oceans, where sunlight struggles to penetrate, life organizes itself in near-permanent darkness. To navigate and survive in this hostile environment, marine creatures have had ...

Sonselasuchus cedrus, discovered in fossils from Arizona, was a crocodile relative from the Triassic period that grew into an ...

The platypus is one of nature’s strangest mammals. This egg-laying animal sweats milk, hunts by sensing electrical signals, carries venomous spurs, and even glows under ultraviolet light. Discover the ...

At the Leibniz Institute on Aging – Fritz Lipmann Institute (FLI) in Jena, a new research group led by experimental biologist Dr Dennis de Bakker began work in January 2026. This was made possible by ...

Three tiny Purgatorius teeth found in Colorado are helping scientists trace how early primates evolved and spread across North America.