Scientists know more about space than the ocean, according to Columbia University's Earth Institute. So in a sense, a majority of the creatures lurking below the surface may as well be aliens. Researchers from Dalhousie University in Nova Scotia, Canada, believe that 91 percent of them are still unknown. Of the 235,000 or so species we do know about, many have adapted to their environment with peculiar camouflage, bioluminescence, and mating habits—leading to some seriously strange appearances. Here are 50 of our favorite strange sea animals.

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