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Fixed in one place; immomible.

Sessile animals are usually permanently attached to a solid substrate of some kind, such as a part of a plant, a dead tree trunk, or a rock. Typically sessile animals have a mobile stage at some point in their life cycle such as barancles that have a planktonic larval stage or jellyfish who develop as sessile polyps and mature into a mobile form. Some examples of sessile animals include barnacles, mussels, sponges, corals, and jellyfish.