Can you put your mouse in a hamster cage?

Not really, they won't try to kill each other. I tried it because I had a mouse and a hamster but only one cage. I figured why not? Well, they didn't try to kill each other. It's just that the hamster, Nibbles, keeps stealing Lionel's (mouse) place. Like when Lionel was on the wheel, Nibbles tried to steal his place. Which lead to fighting. So it's alright if you put them together in a cage. Just remember to monitor them so the hamster doesn't try anything funny. But yeah, you can put a mouse in a hamster cage.