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There are quite many parasites doing that, living in another organism while letting it live. The most common example is the flea, or tick, attaching itself and sucking blood. But there are many other, and far more exotic examples, such as an arthropod practically biting off a fish´ tongue and replacing it with its own body, and worms living inside the eyestalks of snails!

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13y ago

What else can I help you with?