Originated From QueryCAT
As they aren't very big I'd say that a cage that is about 2 feet square and 3 feet high is plenty big enough for them. Now, I've seen some round cages so you could probably judge from that. I've never actually had any myself but that is what I've see as about the size other people have used.
http://www.youtube.com/watch?v=6GjMe4gnheA&feature=related
Try this link. I think you will really like it. There are more too!
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them