I got home from work today to find the duckling that had started unzipping when I left for work still not hatched but with a very big hole in the top of the egg. I turned on the torch for a better look and realised the egg was full of liquid. Poor little guy had broken the yolk sac and would have drown if I had not intervened. I tipped out what fluid I could and tried to dry around her face with a cotton bud and put her back into the incubator. Half an hour later after kicking with one free leg she was out of the egg and the risk of drowning was at least over. She still has the yolk sac attached- and may not make it- But I am hopeful she may pull through. I have had ducklings not hatch before and had some drown before hatching too and wonder if it has ever happened before or if this is the first time I have seen it. It could explain why I have lost some in the past, as I dont open every egg to see what may have gone wrong. Has anyone else ever had a duckling break the yolk sac while trying to hatch??