Sense Sonnet - Pumper

 Hermit Crab

A hermit crab humans call me,

A misnomer as humans do.

First, not a true crab do I be.

Second, we're quite a social crew.

Like lobsters I have exposed tail

Which I protect with a borrowed shell.

When an empty shell does avail,

We'll check who it fits most well.

When a new shell best fits me, I

Hand my old shell down to one, and

So we all share the shell supply

For which are always in demand.

I guess my name no matter makes,

Humans rarely admit mistakes.