Jan 7, 2026 · 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.

Jan 7, 2026 · An informative classification of dinosaurs was made by T.H. Huxley in 1868. Joseph Leidy named some of the earliest dinosaurs found in America, and O.C. Marsh and E.D. Cope contributed …

Jan 7, 2026 · No universally accepted classification of dinosaurs exists. Occasionally, for example, the Sauropodomorpha have been divided into more or fewer lower-rank categories (e.g., families, …

Jan 7, 2026 · These sites, dating from the Late Triassic Period (235 million to 201.3 million years ago) to the latest Cretaceous (66 million years ago), document herding as common behaviour among a …

This Encyclopedia Britannica animals list features 6 awesome types of dinosaurs.

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

From studying these remains, scientists think that dinosaurs were the ancient relatives of today’s crocodiles, snakes, lizards, and birds. Below is a guide to some well-known dinosaurs.

Nov 4, 2025 · Although the larger dinosaurs, such as the carnivorous Tyrannosaurus and the herbivorous Iguanodon, are the best-known, many smaller forms also lived in Cretaceous times.

Dinosaurs lived throughout the world, and their fossils have been found on every continent. They lived in all different kinds of environments as well, ranging from tropical forests to dry, sandy deserts.

Jan 7, 2026 · Dinosaurs are currently defined as Triceratops (representing Ornithischia), birds (representative of Saurischia), and all the descendants of their most recent common ancestor.