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: Watch David Attenborough Dynasties series trailer here: WATCH MORE: New on Earth: Oceanscapes: Wild Thailand: Welcome to BBC EARTH The world is an amazing place full of st