I had 3 unhatched eggs today that had no movement and showed no sign of hatching, so I decided to break into the air cell and make 100% sure they wern't alive before ending the hatch.... well, they wern't, they had not fully taking in the yolk but looked pretty formed !!!! I was wondering what causes them to die like that ? Did they die before 21 days or right around 21 days ??? How long does it take them to take in all the yolk ??? Just wanted to know so I could fix the problem in other hatches if possible.... Thank you !!!!