Crustacean. [Said promptly, as he slips to the back of the kitchen and deposits her clothes there. Then it's to the counter with Sayo] Specifically, I'm thinking a freshwater crab... but there are some that live on land or the ocean.

They typically eat algae, other plant life -- [p-pause... >_>] And sometimes non-arthropod invertebrates, among other things.

[i.e. worms]