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Pram Bug Video
Video of a pram bug (Phronima sp.). Pram bugs are parasitic amphipods that are often found living within a barrel of a previously devoured siphonophore, salp, or jellyfish. Fun fact: this animal was the inspiration for the xenomorph in the Alien franchise movies.
Credit

Video courtesy of Exploring Pelagic Biodiversity of the Gulf of Alaska and the Impact of Its Seamounts.