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

The discovery of Ahvaytum bahndooiveche, a 230-million-year-old dinosaur in Wyoming, reveals dinosaurs existed in the ...

This discovery challenges the long-held belief that dinosaurs originated exclusively in the southern supercontinent, Gondwana.

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

With a recent radioisotopic analysis of the fossil specimens dating the remains to around 230 million years old, this tiny ...

Learn more about this newly named dinosaur and how it's discovery sheds light on dinosaur evolution.

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

For years, scientists believed that dinosaurs first emerged in Gondwana—the southern portion of the ancient supercontinent ...

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

How and when did dinosaurs first emerge and spread across the planet more than 200 million years ago? That question has for ...

Study finds the oldest known North American dinosaur fossil in Wyoming, challenging previous beliefs about dinosaur evolution.

Dinosaurs inhabited the Northern Hemisphere millions of years earlier than scientists previously thought, according to the new research.