(I just put this in the wrong category and will be scolded so here I am in the pest section.) I have new pullets laying everywhere so I locked them in their run and coop and put a marked egg in the nest box. The next day there was a new egg but the marked egg was gone without a trace. Then I put a golf ball in the box and a few days later I had two new eggs but the golf ball was gone. I live in NE Wisconsin. What critter do you think?