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.

2025年1月25日 · 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 Epoch) and thrived worldwide for nearly 180 million years.

Dinosaurs are a group of reptiles that have lived on Earth for about 245 million years. In 1842, the English naturalist Sir Richard Owen coined the term Dinosauria, derived from the Greek deinos, meaning “fearfully great,” and sauros, meaning “lizard.” Dinosaur fossils have been found on all seven continents.

2024年6月6日 · Dinosaurs were the dominant land vertebrates during the Triassic and Cretaceous periods of the Mesozoic Era. Most scientists now consider birds to be dinosaurs. The non-avian dinosaurs (e.g. dinosaurs that weren’t birds) were wiped out in the Cretaceous–Paleogene (K-Pg) extinction event, which occurred around 66 million years ago.

2019年8月26日 · You might be surprised by what you don't know about dinosaurs—for example, some evolved into birds, and they lived at the same time as some mammals. Skip to content Menu

Article Types of Dinosaurs Learn how many species have been discovered, and see photos and information about over 40 types of dinosaurs. Article Dinosaur Bones Discover what scientists can learn by studying fossils and how these fossils are stored in the Museum’s collections.

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.

Find out facts about dinosaurs, including Diplodocus and Stegosaurus, and uncover what science is revealing about the appearance and lives of these prehistoric animals. Discover dinosaur news, videos, quizzes and crafts.

Absolutely everything you want to know about dinosaurs

2025年1月25日 · Dinosaur - Extinction, Fossils, Evolution: Dinosaurs lived in many kinds of terrestrial environments, and although some remains, such as footprints, indicate where dinosaurs actually lived, their bones tell us only where they died.