Hermit Crabs Line Up By Size to Exchange Shells

Anyone with an older brother or sister knows that clothes “shopping” often meant begrudgingly sifting through hand-me-downs rather than perusing the latest fashions at the mall.

But for hermit crabs, the hand-me-down system isn’t second-best, it’s a matter of life and death. And as a new clip from the BBC show Life Story shows, the swapping process is remarkably orderly.
Constantly Renovating
Hermit crabs need shells: without them, the critters will bake under the sun’s punishing rays,

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