Dinosaur - Wikipedia
Dinosaurs are represented on every continent by both extant species (birds) and fossil remains. Through the first half of the 20th century, before birds were recognized as dinosaurs, most of the scientific community believed dinosaurs to have been sluggish and cold-blooded.
Dinosaurs ‑ Extinction, Timeline & Definition - HISTORY
2009年10月27日 · The prehistoric reptiles known as dinosaurs arose during the Middle to Late Triassic Period of the Mesozoic Era, some 230 million years ago. They were members of a subclass of reptiles called the...
Dinosaur | Definition, Types, History, Names, & Facts | Britannica
4 天之前 · Dinosaur, the common name given to a group of reptiles, often very large, that first appeared roughly 245 million years ago and thrived worldwide for nearly 180 million years. Most died out by the end of the Cretaceous Period.
A Complete Dinosaur Timeline to Extinction: How Long Did They …
2023年6月21日 · The history of dinosaurs spans millions of years. Learn about the different periods of the dinosaur timeline, from the Triassic to the Cretaceous, and explore the fascinating world of these prehistoric creatures.
Dinosaur Facts - American Museum of Natural History
Quick facts about dinosaurs for kids and grown-ups! Find out what dinosaurs ate, how they may have behaved, what they may have looked like, and more.
Dinosaurs - American Museum of Natural History
Dinosaurs are a group of reptiles that first appeared about 245 million years ago. They dominated the planet until an extinction event wiped out a large swath of life on Earth about 66 million years ago. But now we know that the Age of Dinosaurs never ended. Instead, a group of dinosaurs gave rise to a new, small airborne form: birds.
Dinosaur - Extinction, Fossils, Evolution | Britannica
4 天之前 · As the dinosaur line arose and experienced its initial diversification during the Late Triassic Period (235 million to 201.3 million years ago), the land areas of the world were in motion and drifting apart.
Dinosaur - Extinction Causes, Evidence, & Theory | Britannica
4 天之前 · Dinosaur - Extinction Causes, Evidence, & Theory: The mass extinction of dinosaurs 66 million years ago remains a misconception; the fossil record shows that dinosaurs were already in decline during the late Cretaceous.
Dinosaurs - Natural History Museum
Discover dinosaur news, videos, quizzes and crafts. Find out facts about dinosaurs, including Diplodocus and Stegosaurus, and uncover what science is revealing about the appearance and lives of these prehistoric animals.
Dinosaurs - Education | National Geographic Society
Dinosaurs have long captured our imagination as reptilian creatures with menacing teeth, claws, spikes, and hammering, bony bulbs. They roamed Earth roughly 175 million years ago, and most were wiped out by an extinction event roughly 65 million years ago.