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In the Cuttlefish, the cuttlebone is filled with gasses and helps control the fish's buoyancy in the water. While for years people have harvested and used cuttlebones for various purposes, the most widely recognized use of the cuttlebone is as a supplement and exercise toy for birds. You won't find any cuttlefish in the United States, but they are quite common swimming in the English Channel. While they don't look like an octopus, they have eight arms just like one as well as two tentacles. Their main diet preferences are crab and shrimp, yet they have been known to eat fish as well. Interestingly enough, they have what has been called a "parrot-like beak."