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Keywords:devonian, dunkleosteus, ancient, animal, arthropod, background, compound-eyes, era, exoskeleton, extinct, fossil, illustration, insect, large, life, nature, ocean, ordovician, paleontology, permian, pincers, prehistoric, science, sea, triassic, trilobite, underwater, wildlife, zoology, fish, cambrian, animation, placoderm, giant
