A hermit crab changes its shell when it has grown large enough to need a bigger home. This type of crab has a soft abdomen or "tail", which is folded up under the body, but it is not protected by as hell of its own as are most other crabs. instead the hermit uses empty snail shells as portable shelters, often having to fight with another crab for posses ion of an attractive home. some times the home seeker pulls out the original occupier, eats it and then takes over the shell.
one of the claws of the hermit is larger than the other. The crab uses this to stop up the entrances after withdrawing into the shell. The last two legs pads which grip the inside of the shell and hold the body in position. The crab has a spiral shaped abdomen and moves in and out of Otes shell with a spiral movement.
One kind of hermit occupies a sponge which which conveniently grows at the same pace as the crab. some times sea-anemones enter into partnership with hermit cranes and tale up residence on top of the shells . The crab provides the sea-anemone with transport and in return, receives an extra shield against attack.
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