I'm the proud owner of 7 ratties.
I have 3 males, Percy, Pedro and Peachy who I have adoptred from a guy who was leaving to uni and couldn't keep them

I've had them 3 months now and they're really sweet and friendly! They fight a little bit, but not seriously. No bites or bleeding, the males are i guess just fighting for 'top dog' or rat, in this case.
I also have 4 females, who are roughly 1 year and 6 months called Bella-Donna, Bluebell, Bramble and Begonia. All B's! They're really tiny for rats, I mean I have had rats before these lot and they were really big, but these ones are almost 1/3 the size of my boys.
Previously, I have had: Violet, Lavender, Daisy, Honey-suckle(Honey), Chewy and Ratatoulie! Chewy Lived to at least 4 years, with me, but he was full-grown when I got him. Violet was my fav, we had this special bond that i havn't shared with her sisters or another rat since! She died over a year ago now, but i really miss her.