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An underwater photo of sharks
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Blacktip Sharks by Enric Sala

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A geneticist samples shark DNA
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Dr. Mahmood Shivji

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Shark Sizes: Whale Shark 46 feet, Basking Shark 33 feet, Great White Shark 23 feet, Megamouth Shark 15 feet, Nurse Shark 13 feet, Mako Shark 8 feet, Blacktip Reef Shark 6.5 feet, Bonnethead Shark 3.4 feet, Dwaf Lantern Shark 6 inches
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What is the Biggest Shark? A Chart Shows the Diversity of Shark Sizes

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A great white shark gaping its jaws at the surface of the water; gaping is used as a form of communication in sharks
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Gaping Jaws of a Great White Shark

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A tiny yellow goby living inside an abandoned can on the seafloor; Suruga Bay, Japan
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Image Gallery: The Perfect Underwater Photo

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