Just know that all 3 of mine and Lori's died while zipping. They started and then couldn't finish for some reason and died. And it's very quick. Chirping and progressing 1 min and gone the next. Praying all of yours make it.
Yes, 110% TOTALLY normal, Perfect HEALTHY duck, Chirping Like a Son of a gun, then all of a suddenly, in a blink of an eye. BOOM, dead. Its like ***??????
I was sooooo excited to see mine zipping, kept checking on him every 1 1/2 had my timer set because I was cleaning coops, so when the Timer went off, I ran in the house to go check my little guy, After the 4th time. BOOM dead, half his little head was out, I could see his chest in the shell everything looked COMPLETELY fine.
I even did mouth to mouth on mine. LOL I was desparately. I wanted him SOOOOO bad to live..
So as soon as they start zipping, DON"T EVEN HESTIATE, once they zip, it's a 100% for sure it's totally absorbed, So go ahead and get his head OUT. Don't wait like I did, do it IMMEDIATELY...
I'm not sure what the cause is yet, I can guess and say its probably because they are sooo small, they just don't have the energy to complete. But my next batch, I will be sitting very close to the bator watching to see what goes down...