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 …

Nov 11, 2025 · dinosaur, (clade Dinosauria), 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 …

Get to know the different types of these reptiles that dominated the Earth before mammals here. Classification based on alphabets: Since there is no way to confirm and classify all the dinosaur …

Resources to help students understand everything from basic dinosaur biology and evolution, to the tools and methods of modern paleontology. Paleontologist Mark Norell answers kids’ questions.

Scientists estimate over a thousand dinosaur species once roamed Earth. Learn which ones were the largest and the smallest, what dinosaurs ate and how they behaved, as well as surprising facts about …

Oct 27, 2009 · Scientists first began studying dinosaurs during the 1820s, when they discovered the bones of a large land reptile they dubbed a Megalosaurus (“big lizard”) buried in the English …

Mar 27, 2025 · The word “dinosaur” isn’t a catch-all term for just any scaly, prehistoric giant. “There’s kind of a misconception that any big extinct thing was a dinosaur,” Smith says. In fact, dinos are a …

Jun 6, 2024 · Complete guide to dinosaurs, with list of dinosaurs from each period. Dinosaur evolution, extinction, types, plus interesting facts.

Get your fill of dinosaur facts and fun, and find out all about the reptiles that once dominated our planet. Ever since they were first identified in the 1800s, dinosaurs have sparked the imagination of kids and …

Dinosaurs were a specialized group of land reptiles that lived during the Mesozoic Era, also called the "Age of Dinosaurs". The Mesozoic was the period of time between 252 million and 66 million years ago.