I have a newly aquired colony of rats and 2 of the females appear pregnant. If they are pregnant from a male other than then one that is in with them now, do I need to move them before they give birth?
One of the females is very large with a pronounced waddle and has lost most of the hair around her nipples. Should birth be coming soon for her?? This will be my first litter and I just want to make sure that I get it right. Any tips on first litters would be greatly appreciated.

