Abalone are mollusks. They are found on seashores and shallow coastal waters in those parts of the world that have warm water, a rocky floor, and plenty of seaweed (their food of choice).
Abalones are part of a group of mollusks called gastropods. Gastropods have coiled shells. An abalone's shell is wide and flat and is used as a shield over its back.
The ridged outer surface of the shell is typically encrusted with algae, which allows it to blend into the surrounding rocks. The body within the shell is simple. It clings to and crawls across rocks using a "foot" - a large muscle. Around this foot are tentacles that detect chemicals in the water. It also has a pair of simple eyes, which can distinguish between light and dark.
Abalone are a popular seafood. Below is a video a diver made of hunting red abalone off the coast of Sonoma, CA for his dinner.
http://www.youtube.com/watch?v=h7Q5bzewFZo
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