Possible animals

Thinking about possible animals which I could use instead of the 'Queen Rat' (adapting the story etc.)

http://www.bypest.com/rats.html London pest control. Animals include:

Rat

Mice
Cockroach

Pigeon

Squirrel

Also, possibly foxes as you can always see them in London at night. Possibly bats. I still quite like the rat though. I will try to experiment with all the 'pests.'

Going to think about their anatomy, habitat, sleeping patterns, texture (fur, shell etc) and create character from this.