is that veins up towards the air sac? kinda looks like them . if so that would mean that duckling is pretty far along. Either that or it's rotten but I don't see how because she hasn't been sitting that long this go around right? Sometime other ducks will go in and mess around in the eggs. I'd take a piece of ply wood if you have some and lean it over to the wall and make like a lil private area for the nest it may not keep everyone out if she leaves but it might make her feel more secure.be sure to secure the ply wood to the wall to keep it from falling onto her or the eggs.
Sorry, I should have said that was a picture from one of my candling charts. I'm afraid it is a rotten egg as you said, she hasn't been sitting that long. BIG SURPRISE tonight when I went to put them up. Momma was back on the nest. She came out to eat meal worms with the others and I was able to take some pics. We have two duck houses inside a fully enclosed horse stall turned duck pen. The big house is where everyone else stays at night and the small house is where her nest is.
Small house inside looking to right:
Looking down at nest:
This pic shows the divider moved. When it was there, each side had a nest of eggs:
When I left a bunch the other day, this is how many

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