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Cephalopod evolution is a fantastic subject for lovers of drama: The moment the protagonist appears to be done for, a narrow escape ensues. When fishes developed jaws, cephalopods countered with beaks. When fishes became faster swimmers, cephalopods traded their shells for speed and got better at hiding with dynamic camouflage. InSquid Empire, Danna Staaf turns esoteric knowledge about the evolution of cephalopods into a page-turning read for all audiences.