Dinosaurs are a diverse group of animals of the clade Dinosauria. They first appeared during the Triassic period, 231.4 million years ago. They were the dominant terrestrial vertebrates for 135 million years, from the start of the Jurassic (about 200 million years ago) until the end of the Cretaceous (66 million years ago). When the Cretaceous–Paleogene extinction event led to the extinction of most dinosaur groups at the end of the Mesozoic Era. The fossil record indicates that birds are modern feathered dinosaurs. They have evolved from theropod ancestors during the Jurassic Period. Birds were the only dinosaurs to survive the extinction event that occurred 66 million years ago.
Following will come pictures of dinosaurs to understand things more clearly.
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Jurassic park is a very famous movie about dinosaurs. During a preview tour, a theme park suffers a major power breakdown that allows its cloned dinosaur exhibits to run amok.Besides the lost world Jurassic park is yet another famous movie about dinosaurs. A research team is sent to the Jurassic Park Site B Island to study the dinosaurs there while another team approaches with another agenda.The last dinosaurs died approximately 65 million years ago. Although the cause of their extinction is still a mystery, climatic change, diseases, changing plant communities, and geologic events could all have played a role. Lately, dinosaur extinction theories have been the subject of much debate and controversy.