If you are thinking about a mouse, what about a rat? Mice... -Very small, do not need much space -enjoy cage mates -Take time to tame -Can bite, but if handled from a young age, tend not to -Escape out of very small openings and are very hard to fin ...
Keep a good part of his "nest" from the old cage when you put him in the new cage. That way his "home" will still smell the same when he is moved to the new cage. He will also appreciate not having to completely rebuild a nest in the new cage and tha...
I like the Kit Lux 3, especially if your critter is a little, ah, rounder than most. The little ladders should be easier for you pet to navigate than the tiny tubes in the other model.