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two mangrove trees in the crashing waves
Overview

Mangroves

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Slideshow

Underwater Habitats

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A sea turtle swimming
Overview

Sea Turtles

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The Peninsula Valdes in Argentina was inscribed on the World Heritage List in 1999. The site is home to important breeding populations of the endangered southern right whale (Eubalaena australis), southern elephant seal (Mirounga leonina), and southern sea
Slideshow

Marine World Heritage Photo Gallery

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a man snorkels above a reef while a woman in flippers sits on a boat
Timeline

Sunscreen in the Environment

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
Overview

Giant Squid

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Jellyfish produce mucus, especially when stressed, which can interact with oil and break it down. This moon jellyfish is sloughing off mucus that has mixed with droplets of oil.
Article

How Jellyfish Break Down Oil After a Spill

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Hurricane Katrina
Overview

Hurricanes, Typhoons, and Cyclones

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An oceanic whitetip shark swims near a biologist in the Bahamas.
Slideshow

Spectacular Shark Pictures

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A harp seal in icy water
Overview

Seals, Sea Lions, and Walruses

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Photograph of the underside of a gelatinous octopus with a bright yellow bioluminescent ring around her mouth.
Slideshow

Bioluminescent Animals Photo Gallery

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