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Although sharks, skates, and rays do not have scales, they are still classified as fish. These creatures are all members the cartilaginous fish group; instead of bones, their bodies are supported by cartilage (like a person's nose). Cartilage is more flexible than bone, giving shark fins an almost rubbery appearance. As migratory fish, sharks spend most of their time in open water. With more than 400 types of sharks on the planet, shark species demonstrate great diversity in size, appearance, habitat, and behavior.

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