A newfound "chicken-size" dinosaur, recently unearthed in Wyoming, changes what paleontologists thought they knew about how ...

Discover Uncus dzaugisi, a 555-million-year-old worm-like fossil, offering the first Precambrian evidence of Ecdysozoa ...

But this is where Ahvaytum may rewrite the origin story because it originates from the North American landmass, which once formed part of Laurasia. At roughly 230 million years old, it is comparable ...

A chicken-sized dino, the oldest known in North America, has thrown a wrench in the widely accepted timeline of early ...

Researchers discovered Ahvaytum bahndooiveche fossils in Wyoming, revealing dinosaurs in Laurasia earlier than believed.

Paleontologists say the fossils could prove dinosaurs lived in the northern hemisphere millions of years earlier than ...

Scientists have discovered the oldest known saber-toothed predator, a 270-million-year-old gorgonopsian therapsid fossil.

The origin of mammals is shrouded in mystery, but every fossil clue helps rewrite the story. A new discovery on a Mediterranean island is challenging what we know about when—and where—mammal ancestors ...

Scientists have discovered the oldest known animal with saber teeth: a predator that lived 270 million years ago. This animal, from before the age of the dinosaurs, was a dog-like creature that was ...

Before dinosaurs walked the Earth and ... missing from the fossil record. But the discovery of a newly identified gorgonopsian — the oldest saber-toothed animal ever found — is filling a ...

Paleontologists discovered "North America's oldest dinosaur," challenging the origin story of the dinosaurs that once roamed ...