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A male mudflat fiddler crab (Uca rapax) waves its huge claw to impress females and threaten competitors.
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The Mudflat Fiddler Crab

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Scientist Martha Nizinski examines a sample of the deep-sea coral Lophelia pertusa, collected 600-m (1,969-ft) deep off the coast of the southeastern United States.
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Deep-Sea Coral Sample

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Squid expert Dr. Clyde Roper examines specimens stored in jars in the Smithsonian collection.
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Dr. Clyde Roper

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a white coral on the seafloor
Article

An Ocean Heat Wave Reaches to the Seafloor

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A Honduran small-scale fisherman on a boat setting out to fish.
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Clever Measures Track Fishing Pressures

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Aegina, a type of jellyfish, swims through the water.
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A Look at Life in the Deep Sea

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The mauve stinger is a glowing jellyfish.
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Glowing Mauve

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The Japanese spider crab may be big but it is not invincible.
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Japanese Spider Crab

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Tomopteris's bristles produce yellow bioluminescence, a unusual color among midwater animals, nearly all of which make some sort of light.
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Glow Worms

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