I have not but that is very interesting. Can you describe it more?
The chick was VERY active only yesterday. I can see a fully developed feather so I think it is about ready to hatch. There is a clear aircell spot that never detached until today. I was rotating the egg to see if the chick was alive and noticed bubbles. I thought it was the albumen or something until I noticed that it moved near and in the aircell too. Now the air cell is bubbly and there seems to be pickets of air near the chick that bubble up every once in a while. So confused.