Fossils

Fangy Whatcheeria measured up to 6.5 feet (2 meters) long, and more than 300 million years ago, it was the apex predator in the sinkholes-turned-lakes of the American Midwest.

An ancient worm unearthed in China has one of the oldest fossilized brains ever found. The brain's shape could also help solve a centuries-old debate about the evolution of arthropods.

Paleontologists have discovered fossils belonging to a newfound species of tyrannosaur, which could fill an important gap in the evolutionary history of T. rex.

Scientists recently unearthed fossils of strange ocean creatures that lived about 460 million years ago and were unlike any animal alive today.

Researchers in Spain have unearthed a never-before-seen species of ancient marine turtle, the largest of its kind ever uncovered in Europe.

Extremely detailed Cambrian fossils show that enigmatic skeleton tubes belonged to ancient ancestors of modern jellyfish.

A global drop in oxygen levels about 550 million years ago led to Earth's first known mass extinction, new evidence suggests.

Scientists found preserved brain tissue in a Cambrian fossil.

Fossils called stromatolites from Western Australia were created by microbes 3.48 billion years ago.

Pachycephalosaurs probably didn't butt heads at high speeds. Instead, they likely kickboxed like kangaroos.