Dinosaur, Definition, Types, Pictures, Videos, & Facts

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 out by the end of the Cretaceous Period. Many lines of evidence show that one lineage evolved into birds about 155 million years ago.

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Dinosaur sported impressive mane and had ribbons protruding from