Is There an Untried Shape Left to Shift?

Dragon shifter books seem to be coming back, although wolf shifters still seem to be popular.

Which makes me wonder if there's a beast left that someone hasn't written about as a shifter?

I've seen all sorts of feline shifters, including ocelots, tigers, and leopards.  And I've read of odd shapes like snakes and ducks.

But I can't help but scratch my head and try to figure out the next creature of choice.

Hmm...hamster shifters, anyone?