Where they live

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They usually dwell in and around small beaches in colonies of 100 or more, and do not thrive in smaller numbers. Obviously their mobile home is the shell that they carry around on their backs which they outgrow when they get larger and must find a bigger one. There is frequently strong competition among hermit crabs for the best available shells. Some shells they have even have one or more sea anemones growing on the shell that can be very useful, because the anemones tend to scare away fish and other marine predators that might otherwise attack the crab. The sea anemone also benefits because it is well positioned to consume loose fragments of the hermit crab's meals.

 

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