Ключевые слова: ancient, animal, animals, armored, carnivore, carnivorous, concept, creature, devonian, dinichthys, dunkleosteus, dunkleosteus terrelli, extinct, fish, giant, horizontal, huge, hunter, jaws, model, nature, no people, organism, paleontology, placoderm, predator, primeval, sea life, species, tail, teeth, toy, wildlife,