Dinosaurs first appeared about 230 million year ago during the Triassic period, These amazing reptile then dominated life of Earth until they become were Megalosaurus (Great lizard) by William Buckland in 1824 and Iguanodon (Iguana tooth) by Gideon Mantell in 1825 they were named before the word "Dinosaurs" had been invented. The name dinosaurs (Terrible lizard) was suggest by British scientist Richard Owen in july 1841. Since then 700 different species have been identified. Not all dinosaur were enormous- some measured less than 60 cm long about the size of chicken.
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