These small crabs (about 1 in. in length) are always on the lookout for a new shell to live in. Hermit crabs don't grow the shells themselves but pick up the shell of a dead gastropod. Hermit crabs wrap their uropod around the inside whorl of the shell so you can't pull them out.
Long-clawed Hermit Crab
(Pagurus longicarpus)
 

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