I have two hens that have been laying on fertile eggs for a little over 2 weeks now. In the past week, something has been sneaking in and taking eggs right out from underneath the girls. The only evidence left was two eggshells intact with about a two inch hole with everything sucked out. I put cinder blocks over all the holes around the bottom of the coop, closed off the run, and shut the front door at night. That worked for the night, but I had to leave the door open during the day so the other girls can come inside and lay their eggs. Another egg was missing when I checked later this afternoon. I moved the broody hens and the eggs to boxes in a higher row and shut the door again tonight. The girls were laying in the first row of boxes that is level with the floor. Anyways, any ideas on what is doing this? I was thinking maybe a rat because whatever it is hasn't done any damage to the hens. Any help would be appreciated!