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This deep-sea jellyfish was caught on film by an ROV east of Izu-Oshina Island, Japan.
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Atolla Jellyfish from the Waters of Japan

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This deep-sea coral specimen shows the bands that help marine scientists learn how ocean conditions changed over time.
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Deep-Sea Coral Bands

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Mantis shrimp have built-in polarized vision to help them see underwater—and maybe even communicate.
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Built-in Underwater Polarized Lenses?

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Seahorse couples (such as these Hippocampus histrix) greet each other every morning with a unique dance that sometimes involves changing color. The couple promenades and pirouettes together for several minutes before separating for the rest of the day. The
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Dancing Seahorse Pairs

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Two thorny seahorses sit back to back underwater.
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Seahorse Lovebirds

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A humboldt squid releases ink.
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Humboldt Squid Shoots Ink

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Photograph of several large jellyfish with orange bells, dark red tentacles, and pale ruffly oral arms, swimming against a bright blue aquarium background.
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Pacific Sea Nettles

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Two nautiluses in the open ocean off the coast of Palau.
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A Couple of Nautiluses

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
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Zooxanthellae and Coral Bleaching

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A couple inches wide and up to ten feet long, the bobbit worm stays hidden under tropical sands with just its five antennae poking out—waiting for prey to swim by.
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The Bobbit Worm

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A photo of a squid using bioluminescence to hide in the deep sea.
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Midwater Squid, Abralia veranyi

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This close-up view of salps, which have aggregated together into a long chain, have brilliant red guts from eating red plankton.
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Close-up View of Salps

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