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For more than 150 million years, dinosaurs dominated the animal kingdom on Earth. These creatures resembled lizards. Some of them were the biggest and most terrifying animals to have ever trod on land. About 65.5 million years ago, the last of the dinosaurs went off. Dinosaur fossils were first found in the early 1800s. The remains or imprints of a plant or animal preserved in rock are called fossils. These fossils have allowed scientists to determine that dinosaurs were the ancestors of modern crocodiles, snakes, and lizards. Let's discuss the top 6 most lethal dinosaurs. (06) Ornithomimosauria Theropod dinosaurs called Ornithomimosauria resembled the current ostrich on the surface. They had relatively long, thin necks and tiny, big eyes. This dinosaur only can run fast they can’t fly like ostrich. When compared to later and more evolved species, the taxon's most primitive members (including Pelecanimimus and Harpymimus) possessed a jaw with tiny teeth.  The forelimbs, or ...