4 days ago · 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 …

Nov 11, 2025 · Dinosaur - Extinction, Fossils, Evolution: Dinosaurs lived in many kinds of terrestrial environments, and although some remains, such as footprints, indicate where dinosaurs actually …

Dec 17, 2025 · Dinosaur - Evolution, Classification, Extinction: After dinosaurs were recognized as a new type of fossil animal, popular fascination with them reached a peak in the 1850s with the first …

One day 66 million years ago, an asteroid the size of a mountain struck near the Yucatán Peninsula with an explosive force equivalent to 100 trillion tons of TNT. In that cataclysmic instant, the 165-million …

Dinosaurs roamed the Earth for an impressive span of about 165 to 180 million years. They perished in a mass extinction event about 66 million years ago.

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 worldwide for …

dinosaur, Any of the extinct reptiles that were the dominant land animals during most of the Mesozoic Era (251–65.5 million years ago).

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…

Dec 17, 2025 · 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 …

This Encyclopedia Britannica Animals list features 8 titanosaurs, some of the biggest dinosaurs and biggest land animals that ever lived.