Empty air space in egg

[trailblazn]

Has anyone seen where there is an empty air space on the top and bottom of the egg at day 18? If so, do you know what it's caused by and does the chicks hatch? I'm thinking humidity?

 

[Ridgerunner]

I'd think by day 18 the chick should be filling everything other than the air sac at the fat end of the egg. That sounds like earlier in incubation where you have the air sac at the top and the chick is floating in the egg, leaving another clear space at the bottom.

I usually don't candle at Day 18 though, so I have not seen a lot of eggs that late. A few but not many and that was some time ago. My last candling is usually around Day 14. It may be normal, I'm not sure. I'll subscribe and see what others that candle at day 18 have to say.