Whose Egg?

While walking Moose, Isaac stopped Dan's hunting dog from destroying this last egg – one of three – in a nest that had fallen from a limb in our evergreen tree line. Isaac said the nest was made of twigs and had a downy lining. The blue-grayish-green egg measured one-inch long and had few special markings.


After review in our bird encyclopedia, we only guess at its parentage.


And we still wonder:


Whose Egg is this?