This small, chicken-sized dinosaur lived around 230 million years ago. Interestingly, this pushes back the timeline for dinosaur presence in the northern hemisphere by millions of

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

How and when did dinosaurs first emerge and spread across the planet more than 200 million years ago? That question has for decades been a source of debate among paleontologists faced with fragmented fossil records.

For decades, paleontologists have debated how and when dinosaurs emerged and spread across the planet more than 200 million years ago. The prevailing theory suggested that dinosaurs first arose in the southern part of the ancient supercontinent Pangaea,