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They roamed through forests, stomped through swamps, and dashed across dry deserts. Some munched leafy greens while others devoured raw meat. They lived on the Earth for millions of yearsthen disappeared! Who were they? Dinosaurs!You've probably seen dinosaurs in movies and books. Maybe you've stood next to a dinosaur skeleton in a museum. Hundreds of different kinds of dinosaurs lived all over the Earth. They came in all sizes. Some were only a little heavier than chickens. Others were as tall as a five-story building! The word dinosaur means "terrible lizard." I In fact, the first dinosaur ever named was Megalosaurus"great lizard." Lizards are reptiles, and so were dinosaurs. A reptile is an animal with scaly skin or a hard shell covering its body. Reptiles lay eggs and usually have claws. Crocodiles, lizards, and turtles are some oftoday's reptiles. Let's step back in time, to -------