well i was cleaning the mouse tanks and i noticed i have a prego and it is about time!!!! I have read that it would be harder to breed mice and boy were you right i think i have had them for almost 3 months and i am gonna have my first litter... Know i got the rat thing down pat i have had 3 litters drop with in the last 3 weeks now if i could just get these mice to do that i would be good will post pics as soon as i am a new dad