I still haven't quite figured out how to start a new post, so I am just trying this. We had 19 duck eggs and 18 chicken eggs in a still air incubator. Everything seemed to be going well, on the 21st and 28th day we heard chirping and some pipping started. We ended up with 4 ducklings and 3 chicks. Once we waited the extra few days to see if any more would hatch, we took the remaining eggs outside and broke them open (after candling). All but three eggs had developed almost completely but the babies were dead. What happened? How can we prevent this in the future? Please help. I am broken hearted.