hermit crab
US /ˈhɜːr.mɪt ˌkræb/
UK /ˈhɜːr.mɪt ˌkræb/

1.
paguro
a crab that lives in a discarded mollusc shell to protect its soft abdomen, often changing shells as it grows
:
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The child watched a hermit crab scuttle across the sand.
Il bambino guardò un paguro correre sulla sabbia.
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Many species of hermit crabs are found in tropical waters.
Molte specie di paguri si trovano nelle acque tropicali.