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Animals Dinosaurs are prehistoric reptiles that lived millions of years ago during the Mesozoic Era. They are known for their large size, powerful jaws, sharp teeth, and often distinctive features such as horns, plates, or spikes. Dinosaurs were a diverse group of animals that roamed the Earth, ranging from the massive herbivorous sauropods to the fearsome carnivorous theropods. Fossil evidence of dinosaurs has provided valuable insight into the history of life on Earth and continues to fascinate scientists and the general public alike.