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Keywords:ancient, animal, cambrian, devonian, dunkleosteus, era, exoskeleton, extinct, fish, fossil, giant, illustration, large, life, nature, ocean, ordovician, paleontology, permian, placoderm, prehistoric, science, sea, triassic, underwater, wildlife, zoology, armor, bite, north america, Dinichthys terrelli, apex, predator, carnivore, fin, teeth, jaws, hunter, huge, swimming
