First winter with my girls. They are still laying and the coop seems to be providing them with a comfortable place in spite of cold weather. My problem is that in these really cold patches, I am not getting eggs before they freeze. I even had three this morning that had frozen and cracked. Obviously, collecting them before they freeze would be ideal, but not always possible - the henslay throughout the day and night. Anyone have any suggestions for providing a slightly warmer nesting box? I am not providing external heat, and really do not want to. I do have a heated dog bowl for their water which works great. Suggestions?