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A dinosaur is a type of reptile that lived millions of years ago, during the Mesozoic Era, which spanned from about 230 to 66 million years ago. Dinosaurs were incredibly diverse, ranging from small, bird-like creatures to massive, long-necked giants like the sauropods. They were land-dwelling animals, and their fossilized remains provide valuable insights into the past. Dinosaurs are classified into two main groups based on their hip structure: Saurischia (lizard-hipped) and Ornithischia (bird-hipped). Some dinosaurs evolved into modern birds, making birds the closest living relatives of dinosaurs. The most famous dinosaurs include the Tyrannosaurus rex, Triceratops, and Velociraptor. While dinosaurs went extinct around 66 million years ago, their legacy lives on through fossils, popular culture, and their bird descendants.