Am incubating for the first time this year, after none last year. I knew a good number of the eggs were probably not good, as they were out in the pens for several days with very low temps, I wasn't sure of the fertility of the roos in that cold weather and I'd held some of them a bit too long. They are now two weeks along. I removed the ones last week that were obviously not developing, and checked again today.
One was clear and another was very dark and I couldn't find an air pocked. I removed that one to candle it more clearly, but dropped it! Of course it had a live baby in it. I checked it closely, and decided it was probably something of a blessing I dropped it. It was two weeks along, but clearly had a badly crossed beak, and it appeared its brain was completely out of its skull. I've not checked all of the unhatched chicks, but used to, and have never seen anything like this.
Still have 18 developing silkie and naked neck siklie (showgirl) chicks. Am gathering eggs for a second batch, although I'm trying hard to reduce my flock. I've reduced it from 60 - 120 (including chicks) to 30. That is before any hatches.