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.

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, …

Dec 22, 2025 · Dinosaurs are a diverse group of reptiles that were the dominant terrestrial life form on Earth during the Mesozoic Era, about 245 million years ago. Dinosaurs went into …

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 …

Learn the complete timeline of dinosaurs on Earth, understanding when they lived and how scientists uncovered their ancient history.

Oct 27, 2009 · Dinosaurs mysteriously disappeared at the end of the Cretaceous Period, around 65 million years ago.

Jul 31, 2025 · The age of dinosaurs—also known as the Mesozoic Era—is divided into three periods: the Triassic, the Jurassic, and the Cretaceous. This stretch of time, from about 252 to …

Jul 21, 2024 · Explore the dinosaurs, marine animals, and other life from the Triassic, Jurassic, and Cretaceous periods.

Jun 21, 2023 · Learn about the different periods of the dinosaur timeline, from the Triassic to the Cretaceous, and explore the fascinating world of these prehistoric creatures.

Dec 6, 2022 · Dinosaurs dominated the Mesozoic Era for more than 160 million years, peaking during the late Jurassic to early Cretaceous periods. They are thought to be the most …