Extinct animals are those species which are no longer living. This group includes prehistoric animals like dinosaurs and ice-age mammals, as well as moden species like the Dodo.
  • Dinosaurs
  • Extinct Birds
  • Prehistoric Animals
  • Other Extinct Animals


Riojasaurus was a quadrupedal dinosaur that could not rear up on its hind legs like some of its relatives. It was a large dinosaur that measured about 33 feet in length. What are some of the other dinosaurs the Riojasaurus is related to?

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Dinosaur Discoveries

The oldest record of a fossil dinosaur bones discovery is in a Chinese book written between 265 and 317 A.D. Learn more about dinosaur discoveries and the places they were made in this article.


Next to Tyrannosaurus and Triceratops is ankylosaurus is one of the best-known dinosaurs. Learn more about the Ankylosaurus, Late Cretaceous dinosaurs and dinosaurs of all eras.

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