Amazing Crabs Shell Exchange | Life Story | BBC Earth

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 --~-- WATCH MORE: New on Earth: https://bit.ly/2M3La96 Oceanscapes: https://bit.ly/2Hmd2kZ Wild Thailand: https://bit.ly/2kR7lmh Welcome to BBC EARTH!

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