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dinosaur lake forest prehistoric extinct nature animal reptile apatosaurus apatosaur sauropod herbivore quadruped long neck long tail big large green brown grey blue sky water trees plants rocks mountains clouds sunlight dawn dusk painting illustration art prehistory mesozoic jurassic cretaceous extinction evolution paleontology biology science nature history earth life time past ancient extinct dinosaur apatosaurus apatosaur sauropod herbivore quadruped long neck long tail big large green brown grey blue