Thanks for the quick responses! I'll probably wait until cleaning day this Saturday to move them (they'll be a week old by then). I didn't realize that mice were more prone to that than rats. Good to know being that I have mice, too. I've actually had mice for a lot longer, but no luck in the baby mouse department. I started off with 3 females and two males, but I think I fed my "good" male and kept the eunuch. Someone mentioned to me that male mice will actually try to castrate one another. I'm not sure if that's the case, but it seemed to be true for mine. Either that, or I just ended up with a mouse that pitches for the other team.