I have Phoenix that do this .... they will mother them till they are 3 months old and try to fit in the box with them. Granted I use small dog houses for a lot of my pens but they want to cuddle in the smaller normal nesting boxes.It was starting to make me nuts, lol...she sleeps with them in the nest box she brooded in, and the poop factor was getting out of control You should have seen all of them crammed in there, smdh