Ok, so it was only for an little while. One of our Mini Rexes (Sandy) hopped over the divider into the neighboring pen (there WAS a small gap at the top that I thought would aid ventilation). We put her back into her pen the next morning (as soon as we noticed) thinking nothing of it. Well, two days ago she started pulling fur and this morning...we have new babies!! Pictures and details to come. I am not even sure how many there are, but she had a very nice nest. (This is not her first litter, but it is with us.)