A shell is essential for a hermit crab. It helps him protect his soft abdomen, and helps him maintain the proper humidity level. At some point in time, however, a hermit crab has to abandon his home to search for another one, for many reasons. One is when the crab grows too big for its shell. Another reason is when some sort of fungus enters the shell, which makes the crab uncomfortable.
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Watch as this hermit crab slowly moves to its new home.
(Video Credit: ViralHog/ YouTube)