My female has a green bill. We read that it was a drake thing & thought we had a boy up until the day she laid her 1st egg
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I don't know what was with the #4 pic. Maybe something threw off the white balance of that pic or maybe she was just a bit greener then (the black patch was real small so it might just be that phase. But I would think of this as a green bill on a blue duck:TD, looking back at my pics, my female's looks more like your 3rd pic now, it has gotten less green as she has gotten a bit older. My male's is dark green with a solid black nail.