They're nothing like a mouse or a rat except that I believe they do fall under "rodent" category

If you go to a petstore you should be able to see one there maybe, not sure. And the way that they're different is mainly their fur... I don't know how to describe it... it's like petting air... someone else help? lol

I don't know if you can train them to do tricks or not... someone who has owned them should answer that. We had one once but it wasn't really ours, it just belonged to the guy who lived on our couch. lol We'd let it run free in a house with 7 cats and they were terrified of it because it just didn't care and they'd be all set to try to pounce on it and it'd run straight at them and under them and freak the shit outta them. Most amusing.