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Crabs Trade Shells in the Strangest Way | BBC Earth
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Hermit crabs use abandoned seashells as mobile homes.
As a crab grows, its shell becomes an ever tighter fit.
So, eventually, a crab needs to move in to a bigger one.
Suitable empty shells are few and far between...
And this one is far too spacious for this crab.
But instead of continuing its search, this small crab settles down to wait.
Other crabs, also looking to upgrade to a bigger home,
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