Casie, I don't know what went wrong with this one, but there might not have been anything you could have done. When a ducking is that far out, they don't typically just die as quickly as you're talking about unless something is wrong otherwise. I can speculate about what happened to that one based on that pic if that was the end state. What I would have done is chip away the shell around the neck, and I probably would have zipped the shell like I do with some of my Calls. What happened to that duckling isn't a normal hatch.
You said you built an incubator. Is there any chance you can make another one? I promise you that you will hatch some and you will lose some regardless what you do, for no reason you can figure out. I've had ducklings hatch on the turner, and I've had ducklings die in their shell on hatch day 10 minutes after I confirmed them to be fine.
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