The Yeti Crab has a symbiotic relationship with bacteria on its pincers, cultivating the bacteria for food; it raises its arms over the hydrothermal vents and uses the bacteria to produce energy. :
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Woods Hole Oceanographic Institution (WHOI) on X: "First discovered by researchers in #HOVAlvin, the yeti crab lives near hydrothermal vents on the seafloor. And those hairy arms? They're covered in filamentous bacteria,