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“Scientists believe that sharks are one of the oldest species of animals still in existence. Nature built them as perfect predators. Perfect killing machines. Nature hasn't had to revise or update them much. They were built right the first time. Dolphins are very different. Scientists say that millions of years ago, dolphins were land animals. Sea mammals not very different from humans and other mammals. They evolved their way back into the ocean. Part of that evolution included learning to cope with predators, with killer whales and sharks. I don't now what sea the Taxxon race evolved in. I don't know what natural predators they faced there. But they were not ready for this ocean. They were not ready to go one-on-one with the masters of Earth's deep seas. They were no match for dolphin or shark. -Animorphs #4, The Visitor page 69” — K.A. Applegate