One of my ducks lays a light blue egg that is round. One duck lays a white egg that is more oblong. Both of the ducklings I have came from the white eggs. None of the blue eggs have ever broken through the air cell. They all die in the egg, fully formed. It's ironic to me.. this chart. Because of the blue eggs I've noticed, their air cells are comparable to day 18. But it's only the blue ones.
Interesting.
Interesting.