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Narwhals with their long unicorn-like tusks.
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Narwhals Breaching

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A harp seal pup rests on the ice at sunset in the Gulf of St. Lawrence, Canada.
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Harp Seal Pup at Sunset

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Orange and red deep-sea corals.
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Aleutian Coral Reef

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J. Murray Roberts studies and maps the cold-water corals known as Lophelia in the North Atlantic.
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J. Murray Roberts, Coral Scientist

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Polar bears are threatened by a lack of sea ice.
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Polar Bears on "Thin" Ice

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Rockfish, anemones and other invertebrates inhabit this deep-sea coral reef in Cordell Bank National Marine Sanctuary.
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Deep-Sea Coral Habitat

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A piece of the Hyperbolic Crochet Coral Reef exhibit.
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A Rainbow of Crocheted Corals

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An unidentified earplug from the National Museum of Natural History collection.
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Ocean Objects of Wonder

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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!
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The Design of a Beautiful Weapon

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A map of NOAA's 13 marine protected areas
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40 Years of National Marine Sanctuaries

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
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Coralline Algae: The Unsung Architects of Coral Reefs

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Fish swimming in waters of Bay Islands, Honduras
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Improving Grades for the Mesoamerican Reef

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