They also frequent estuaries and harbors. The thick skin is used for leather. Their diet is mostly fish, including menhaden, eels, other sharks, skates, squid, and also crustaceans. It is a large, fierce predator that eats fish, including other sharks, ray, and just about anything else. It has been known to attack people and will venture into fresh water.
Sharks are buoyant because of the oil contained in their over-sized livers.
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