And get this, it's actually a super-sized hermit crab without a shell.

The hermit crab ate the mollusk and made its home in the shell.

The oldest in situ hermit crab from the Lower Cretaceous of Speeton, UK.

One of Kate and Anna on the beach, crouched over a hermit crab.

I stayed by myself, morosely flipping pebbles at a hermit crab.