An animal thats attached to something else

Barnacles

Explanation:

Barnacles are marine animals that belong to the group of crustaceans which are related to lobsters and shrimps. They can’t move on their own, although they do float around the water during their early phases.

They spend their lifetimes by being attached to something else, usually, a hard substrate which can mean a rock, a seafloor, shells, or even the surface of other animals, such as turtle shells, crabs, or whale skin. They do not harm animals they attach to and most of the barnacle species are harmless in general.

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