I read this earlier and didn’t have much to add. I’ve only had one call duckling hatch with a bill like that, and it didn’t make it. I have very few (if any) of the ducks that I had at that time, so I thought maybe it was genetic. But surprisingly, I’m in the middle of an assist with one now, and it’s bill is not quite normal either. It had kind of an hourglass shape. Wider out toward the tip, and back by the face, smaller/pinched in the middle. It’s still not fully hatched, so I don’t know how it will do. It came from eggs that one of my hens was sitting on for a couple weeks, but when she abandoned the nest, I put them in the incubator. They had gotten a little chilled. Where did your eggs come from? Any issues with the incubation? The other thing is that it’s wing was fully over its head. It pipped on its own, but it wasn’t in the proper position to fully hatch on its own. So there are several possibilities of what went wrong.