Dinosaur | Definition, Types, History, Names, & Facts | Britannica
3 天之前 · 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 …
Dinosaurs Portal | Britannica
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 …
Dinosaur - Extinction, Fossils, Evolution | Britannica
2024年11月20日 · Dinosaur - Extinction, Fossils, Evolution: Dinosaurs lived in many kinds of terrestrial environments, and although some remains, such as footprints, indicate where …
Dinosaur - Evolution, Classification, Extinction | Britannica
2024年11月20日 · Dinosaur - Evolution, Classification, Extinction: After dinosaurs were recognized as a new type of fossil animal, popular fascination with them reached a peak in the …
Dinosaur - Reptiles, Extinction, Fossils | Britannica
2024年11月20日 · Dinosaur - Reptiles, Extinction, Fossils: The chief difference between the two major groups of dinosaurs is in the configuration of the pelvis. The two dinosaurian orders …
Dinosaur - Extinction Causes, Evidence, & Theory | Britannica
3 天之前 · Proposed causes for the extinction of dinosaurs have included everything from disease, heat waves, cold spells, faunal changes, and an asteroid collision during the K–T boundary.
dinosaur - Kids | Britannica Kids | Homework Help
For more than 150 million years, many large and scary creatures walked on land. They were the dinosaurs. These lizardlike reptiles got the name dinosaur from Greek words that mean …
Classification of dinosaurs and theories for their extinction
dinosaur, Any of the extinct reptiles that were the dominant land animals during most of the Mesozoic Era (251–65.5 million years ago). The various species appeared at different …
Dinosaur - Archosaurs, Reptiles, Triassic | Britannica
2024年11月20日 · Dinosaurs are currently defined as Triceratops (representing Ornithischia), birds (representative of Saurischia), and all the descendants of their most recent common …
Titanosaurs: 8 of the World's Biggest Dinosaurs | Britannica
The largest dinosaurs of the era were the sauropods, a collection of four-legged herbivorous species that possessed long necks and tails. A sauropod subgroup called the Titanosauria …