Two mornings in a row I have found an egg on the floor of my coop. I only have one chicken who lays a white egg, and it is a very white egg. Both mornings there has been a very white egg in one of the nest boxes. The egg I'm trying to ID is just different somehow. The shell feels smoother and there is pearliness to it that is hard to capture on camera. It is a little smaller than my white chicken eggs. Sasha tends to lay larger eggs than any of my other chickens. The next lightest eggs come from my Buff Orpingtions I think. At the beginning of winter our ducks decided to move into the coop with the chickens. They have all chosen to stay inside while there has been snow on the ground. I have a blue swedish female and a khaki campbell female. My ducks are around 10 months old now. To my knowledge neither of the females has laid yet. I'm wondering if these eggs could be from one of the ducks. Storeys Guide to Raising Ducks describes khaki campbell eggs as being a pearly white. That pretty much fits these. They're just not any larger than my chicken eggs. Would a duck's first few eggs be smaller like a chicken's might be?
I took a few pictures with one of Sasha's white eggs and one of my paler brown chicken eggs:
In the first picture it is the egg on the left I'm trying to ID
In this picture it is the one on the top:
I took a few pictures with one of Sasha's white eggs and one of my paler brown chicken eggs:
In the first picture it is the egg on the left I'm trying to ID

In this picture it is the one on the top:

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