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Jun 29, 2018 · Over a thousand dinosaur species once roamed the Earth. Learn which ones were the largest and the smallest, what dinosaurs ate and how they behaved, as well as surprising facts about their ...
Dinosaurs are a diverse group of reptiles [note 1] of the clade Dinosauria. 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.
Jul 3, 2013 · 274M views 10 years ago. Join Dinosaurs for incredible kid-friendly videos. Enter the prehistoric world when dinosaurs ruled the Earth. See them hunt and battle. See them roam in massive herds....
3 days ago · Learn about dinosaurs, the diverse group of reptiles that dominated Earth for millions of years and evolved into birds. Explore their origin, extinction, classification, fossil record, and more with Britannica.
Explore the world of dinosaurs with National Geographic's collection of articles, videos, infographics, and more. Learn about dinosaur evolution, extinction, fossils, feathers, pterosaurs, mosasaurs, and more.
Dinosaurs are archosaurs, a larger group of reptiles that first appeared about 251 million years ago, near the start of the Triassic Period. Some other non-dinosaur reptiles are also archosaurs, including pterosaurs (the now-extinct flying reptiles) and modern crocodiles and their ancestors.
Dinosaur, the common name given to a group of reptiles, often very large, that first appeared roughly 245 million years ago (near the beginning of the Middle Triassic Epoch) and thrived worldwide for nearly 180 million years.
