They first appeared during the triassic period, between 243 and 233. 23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is a subject of active research.
Dinosaurs first appeared in the mid-triassic, and became the dominant terrestrial vertebrates in the late triassic or early jurassic, occupying this position for about 150 or 135 million years until their demise.
This era ended up introducing some of the most famous dinosaurs in the history of the dinosaur timeline.
The most prominent examples were the tyrannosaurus rex, triceratops, velociraptor, ankylosaurus,.
Non-bird dinosaurs lived between about 245 and 66 million years ago, in a time known as the mesozoic era.
This was many millions of years before the first modern humans, homo sapiens, appeared.
Learn the complete timeline of dinosaurs on earth, understanding when they lived and how scientists uncovered their ancient history.