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hermit crab anemone

Calliactis japonica
   
Not only do hermit crabs use shells for protection, they will find a stinging anemone and place it on top of their shell (especially when their arch enemy octopus has a lair nearby). On this species of anemone you can sometimes find a small barnacle. The barnacle catches plankton that floats past like the anemone but every now and again it tears off and eats one of the anemone’s tentacles (sort of like having a hat that eats your hair).  
 
 
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