Dinosaurs are a diverse group of reptiles [note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and …

Over a thousand dinosaur species once roamed the Earth. Learn which ones were the largest and the smallest, what dinosaurs ate and how they behaved, as well ...

Nov 11, 2025 · 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.

Delve into these fast facts about dinosaurs for kids of all ages. Discover why the Tyrannosaurus had sharp teeth, where the name “dinosaur” comes from, and more! Dinosaurs are a group of reptiles …

Mar 27, 2025 · The word “dinosaur” isn’t a catch-all term for just any scaly, prehistoric giant. “There’s kind of a misconception that any big extinct thing was a dinosaur,” Smith says. In fact, dinos are a …

Scientists estimate over a thousand dinosaur species once roamed Earth. Learn which ones were the largest and the smallest, what dinosaurs ate and how they behaved, as well as surprising facts about …

The Dinosauria Dinosaurs, one of the most successful groups of animals (in terms of longevity) that have ever lived, evolved into many diverse sizes and shapes, with many equally diverse modes of …

3 days ago · The discovery in the Stelvio National Park was striking for the sheer number of footprints and the location near the Swiss border that has never previously yielded dinosaur tracks, experts said.

5 days ago · Around 1,400 dinosaur species are now known from more than 90 countries, with the rate of discovery accelerating in the last two decades. The year 2025 has so far seen the discovery of 44 …

Dinosaurs were a specialized group of land reptiles that lived during the Mesozoic Era, also called the "Age of Dinosaurs". The Mesozoic was the period of time between 252 million and 66 million years ago.