This is a segment from BBC’s Life Story, and it captures some pretty extraordinary animal behavior. When a new shell washes up on shore, these hermit crabs measure each other and then line up from biggest to smallest until a crab that’s the right size for the new shell comes along. Then the crabs pass their old shells down the line and grab a new, slightly larger one. That way, each hermit crab in the line finds its new home with little hassle.
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