I'm finding out it can be stressful hatching ducklings! When mine were due to hatch I was dreaming about them every night lol. Two out of the three that lived I had to help out of the shell they had pipped for over 30 hours with no progress and the membrane was dry and stuck to them. They would have never gotten out on their own.the rest of them never even pipped. After a couple days mom give up on them so I investigated by breaking them open where the air sac should be and found six of them had internally pipped and looked perfect but had not absorbed the yolk sac or externally pipped.so sad! Does anyone know what causes this?