Okay, so I'm getting another rat around the last of april. It's going to be baby, and I think i'm going to get a male. So, my rat that I have now is pretty much perfect [but I suppose every mom thinks that about her baby. Lol.] He doesn't bite, never has actually but i've been wondering if I should try introducing them when the rat is a baby, or when its gets as big as my rat now. I have cages big enough to keep them both in, and also cages to keep them separated.