David Attenborough | Crabs Trade Shells in the Strangest Way
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.
2015-09-25 19:00:00 - 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.
2015-09-25 19:00:00 - BBC Earth