Not all animals can move around!
When an animal does not possess self-locomotion — meaning it cannot move around by itself — it is said to be SESSILE.
Examples of SESSILE organisms are corals, sponges, anemones, hydra, tube worms, oysters, and barnacles. Even some jellyfish have a sessile stage in their life cycle!
Take a peek at these sessile animals:
[click to view larger]
Most SESSILE organisms are invertebrates that live in water and attach themselves to a solid surface such as a tree trunk, a ship, or a rock. Many underwater sessile species have a motile stage of life when they swim about or just drift around until they find the perfect spot to live, then they permanently attach themselves to it. Sessile species often filter the passing water to obtain their food, so they choose a location within a reliable current. Other species live in tidal pools which have daily movements of water, in and out. The water brings food to the organism, so it has no need for movement.
Many species with the adaptation of sessility are capable of budding or other means of asexual reproduction. Others form clumps and depend upon the movement of water for basically ALL their needs, including sending their young out into the world.
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