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Dinosaurs were enormous creatures that lived on our planet a very long time ago. Science experts say that dinosaurs first appeared exactly 230 million years ago! Since then, they lived all over the world and evolved into many different species. What Were Dinosaurs Like? Dinosaurs were animals whose sizes varied greatly—some were as small as a car, while others were as large as a giant building. Some dinosaurs were herbivores, meaning they ate only plants. Giant dinosaurs like Apatosaurus fed on