Dinosaur - Wikipedia Birds are avian dinosaurs, and phylogenetic taxonomy includes over 11,000 extant species in the group Dinosauria 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 They
What are dinosaurs? - Natural History Museum Our brief introduction to dinosaurs reveals a key feature that gave them an advantage over other prehistoric reptiles Dinosaurs are a group of reptiles that dominated the land for over 140 million years (more than 160 million years in some parts of the world)
Dinosaurs - National Geographic Society 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 their extinction
What is a Dinosaur? - Natural History Museum 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
What is a dinosaur? - Science News Explores 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 specific group of reptiles They have been around continuously for more than 200 million years
Dinosaurs - American Museum of Natural History 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
Dinosaurs 101 | National Geographic - YouTube 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