Well today was day 27 for my gray call ducks. One died in the shell, so I decided that I should help out the call duckling. I broke open the air sac and the membrane was completely dry (they were incubated under silkies). So I wet the membrane and peeled it back. There was some blood. Then I noticed that there was a big yolk sac not absorbed. Later when the duck comes out I will put half of its body in a sandwich bag and leave its head and chest out. I did that last year and the duckling survived. Wish me luck.