David Attenborough: As a crab grows, its shell becomes an ever tighter fit. So, eventually, a crab needs to move in to a bigger one. Suitable empty shells are few and far between… And this one is far too spacious for this crab. Other crabs, also looking to upgrade to a bigger home, soon gather around a [new empty shell.](https://www.youtube.com/watch?v=f1dnocPQXDQ)
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David Attenborough: As a crab grows, its shell becomes an ever tighter fit. So, eventually, a crab needs to move in to a bigger one. Suitable empty shells are few and far between… And this one is far too spacious for this crab. Other crabs, also looking to upgrade to a bigger home, soon gather around a [new empty shell.](https://www.youtube.com/watch?v=f1dnocPQXDQ)