The oldest equatorial dinosaur in the world, and North America's oldest dinosaur, has been described in a new study. Dating back 230 million years, the chicken-sized dinosaur has big implications for our understanding of how dinosaurs spread across the world,

These footprints offer an extraordinary window into the lives of dinosaurs,” one micropaleontology professor said.

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

A newly discovered dinosaur, uncovered by UW-Madison paleontologists, is reshaping the understanding of prehistoric reptiles.

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