Dinosaurs are reptiles that dominated the terrestrial ecosystem for most of their 165-million year existence. They became extinct 65 million years ago (Ma) at the end of the Cretaceous period, and are known from fossilized bones, feces, trackways, gastroliths, and in a few cases impressions of skin and internal organs. These things are collectively known as fossils to paleontologists, who excavate them for study. More and more often, they are being collected by commercial collectors.













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Since the first dinosaur was recognized in the 19th century, their mounted skeletons have become a major attraction at museums around the world. Dinosaurs have become a part of world culture, and have remained consistently popular, especially among children. They have been featured in bestselling books and blockbuster films like Jurassic Park, and new discoveries are regularly covered by the media. The term is also used loosely to describe any prehistoric reptile, like the pelycosaur Dimetrodon, the winged pterosaurs, and the aquatic ichthyosaurs, plesiosaurs, and mosasaurs.

Above Images Are From Dinoplanet
(http://members.aol.com/Dinoplanet/joe.html)













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