Jurassic dinosaurs. Artwork of some of the animals that inhabited the Earth during the Jurassic Period (200-146 million years ago). At lower left is Ardeosaurus, an early gecko. In the sky is Pterodactylus, a flying reptile. On the land are four dinosaurs, from left to right: Stegosaurus, Brachiosaurus, Apatosaurus, and Allosaurus.
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