It is funny to watch how each female deals with her big, busy litter. Some literally run themselves ragged trying to stay on top of the babies and nurse almost 24/7, some of mine construct massive nest walls trying to keep the little leeches at bay so they can get a break LOL. I've a couple of females that take literally every scap of bedding to shore up that high wall, even when I add in more so they don't poop on the bare enclosure floor, they toss that on there too...in a very vain attempt to keep the wigglers in place. It's always funny to watch that first baby rat finally scale the massive wall it's mama built and waddle over to find her. Sometimes I swear those female rats roll there eyes and sigh a bit LOL.