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shells living deep below the Earth may seem outlandish, in the Pacific, the hydrothermal vent crab, Bythograea thermydron is so common at hydrothermal vent fields, that scientists now use sightings of the crabs to find the vents, rather than the other way around. So, perhaps we should not be so surprised. ⠀

As for the unexpected sightings of crystals growing directly on the crabs, & claims that the crabs cultivate these crystals, well, this is precisely the strategy of Decorator crabs

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