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Two octopuses sitting underwater highlight the different textures the animals can take on.
Overview

Octopuses, Squids, and Relatives

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Algae growing on underwater rock
Article

Heroes of Herbivory

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two mangrove trees in the crashing waves
Overview

Mangroves

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

Spectacular Shark Pictures

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a frond of kelp underwater
Overview

Kelp and Kelp Forests

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
Overview

Seagrass and Seagrass Beds

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Colorful Christmas tree worms
Slideshow

Happy Holidays from the Ocean!

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Smithsonian researchers eat a meal in preparation for a fossil excavation
Slideshow

A Squalodontid Success

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a deep sea jellyfish
Overview

The Deep Sea

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The sea star Odontaster validus and sea urchin Sterechinus neumayeri are often found living in association with one another along the Antarctic coastline, here during the Census of Marine Life.
Overview

Sea Stars, Urchins, and Relatives

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Hurricane Katrina
Overview

Hurricanes, Typhoons, and Cyclones

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On average, Arctic sea ice has decreased by four percent per decade since the late 1970s.
Overview

Sea Level Rise

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