| Dinosaur - definition of Dinosaur in Encyclopedia (3579 words) |
 | Dinosaurs are a group of giant reptiles that dominated the terrestrial ecosystem for most of their 165-million year existence. |
| Since the first dinosaur was recognized in the 19th century, their mounted skeletons have become a major attraction at museums around the world. |
| Dinosaurs were highly successful life forms for some 150 million years, however, even more than their success, it is their extinction that has become part of human culture. |
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