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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.

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X-Ray Image of a Tropical Hatchetfish

January 2014

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

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Bioluminescence

September 2013

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