shark

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shark Torpedo-shaped, cartilaginous fish found in subpolar to tropical marine waters. They have well-developed jaws, bony teeth, usually five gill slits on each side of the head, and a characteristic, lobe-shaped tail with a longer top lobe. Sharks are carnivorous, and at least ten species are known to attack humans. There are c.250 living species. Order Selachii. See also dogfish; hammerhead; whale shark; white shark

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