Dinosaurs Coloring Worksheets
Dinosaurs are a distinct group of reptiles belonging to the Dinosauria clade. They originally appeared between 243 and 233.23 million years ago, during the Triassic epoch, while the exact origin and chronology of dinosaur evolution are still being researched.
They became the dominating terrestrial creatures after the Triassic–Jurassic extinction catastrophe 201.3 million years ago.
The majority of dinosaurs died out before the end of the Cretaceous Period, approximately 66 million years ago, but new evidence suggests that one lineage transitioned into birds around 155 million years ago.