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'''Dinosaurs''' were large, reptilian animals which existed from about 230 mya to 65 mya. At the end of the Cretaceous period, a catostrophic mass-extinction took place. This is commonly though to have been an asteroid or massive volcanic event.

'''Dinosaurs''' were an order of reptiles which existed from about 230 million years ago (MYA) to 65 MYA. Dinosurs varied in size drastically from the 3 foot long ''Eoraptor lunensis'' to the 90 foot long ''Diplodocus''.  At the end of the Cretaceous period, 65 MYA, a catastrophic mass-extinction event took place. This is commonly thought to have been an asteroid or massive volcanic event. One significant group of dinosaurs has survived until the present day; scientests consider modern birds to be the direct descendants of theropod dinosaurs.