Crabs near a hydrothermal vent
The ecosystems around hydrothermal vents rely on mats chemosynthetic bacteria, and many species feed on the bacteria. Hydrothermal vents are some of the most unique ecosystems in the world
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"Dense mass of anomuran crab Kiwa around deep-sea hydrothermal vent."
http://en.wikipedia.org/wiki/File:Dense_mass_of_anomuran_crab_Kiwa_around_deep-sea_hydrothermal_vent.jpg
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