As a hermit crab grows its shell becomes a tighter fit so eventually the crabs need to move into a bigger one, leading to an amazing exchange. Taken from Life Story. Subscribe to BBC Earth: http://bit.ly/ydxvrP

Watch David Attenborough Dynasties series trailer here: https://www.youtube.com/watch?v=JWI1eCbksdE –~–

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Wild Thailand: https://bit.ly/2kR7lmh

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