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Hermit crabs line up in order of size to swap and upgrade shells with one another

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“They arrange themselves in an orderly queue, the biggest at the front, the smallest at the back; they’re lining up with one aim: to exchange properties. But none of the crabs can make a move because the chain is not yet complete. They’re all waiting for the right-sized crab to come along.”

The Hermit Crab vacancy chain, as featured in the ‘Home’ episode of Life Story, on the BBC.
via Boing Boing

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