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Tropical hatchetfish, like the one shown in this X-ray photograph, live in the dark depths of the ocean. Like many other deep-sea fishes, they have large eyes and bioluminescent spots on their bellies.
Photo

X-Ray Image of a Tropical Hatchetfish

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A photo of a squid using bioluminescence to hide in the deep sea.
Overview

Bioluminescence

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Screenshot from video of a red whalefish swimming in the ocean.
Video

Whalefish Swimming in the Ocean

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Deep-sea dragonfish from Australia
Photo

Dragonfish from Australia

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Screenshot of "Sea Creatures from the Deep" video showing the teeth of an anglerfish.
Video

Sea Creatures from the Deep: A Video by National Geographic and the Census of Marine Life

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A deep sea anglerfish called a dreamer
Photo

Deep Sea Dreamers

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The long barbel on the chin of this dragonfish has a glowing tip that may attract prey.
Photo

Scaly Dragonfish

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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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A close up profile of an adult anglerfish female from the Linophryne family collected in the northern region of the Gulf of Mexico. © 2016 DEEPEND/ Dante Fenolio
Article

Meet the Tiny Bacteria That Give Anglerfishes Their Spooky Glow

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A photo of a sea toad specimen.
Article

A Sub and a Sea Toad

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A red deep-sea fish specimen.
Article

The Whalefish Mystery

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This aptly named fish has two long fangs.
Photo

Fangtooth Fish

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