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In Parasite Rex examples are given of how much more sophisticated, evolved and sinister parasites are than is generally known. Parasites have the ability, in some cases, to take over the will of a seemingly much more evolved animal. For example, there is a parasite that attacks a certain type of crab and eats up all nonessential soft tissue inside of it, but leaves the basics that allow locomotion---key muscles, the optic nerves, etc.