Went do the hen house to do some house cleaning earlier, saw several eggs & one hen on her nest.Went to go get my egg basket, came back & 1 off the eggs I had just seen is now covered in YOLK. This happened in less than the 3 minutes I was gone. No egg shells any where, no yolk on any of the hens beaks, so what happened ? Any ideas ? Oh yeah there was another hen in the hen house but not on a nest, if that matters.