Regardless of the number of times I have hatched chicks, the process of embryo development fascinates me equally each time. That a chicken egg can evolve from common recipe ingredient into a living, breathing, fluffy-butt in a mere 21 days fits my definition of miraculous.The following photo presentation pairs well-known images from the Purdue Research Institute, depicting embryo development from the inside, with my own photos of candled eggs throughout the 21 chicken egg incubation period. 
I invite you to view any one of my YouTube videos to witness the wonder of hatch day. Baby Chick Hatching in Home Incubator, Singing and Dancing Easter Egger, Hatch Day! Ameraucana Chick Arrives! and Hatching Easter Egger.
Egg candling was done using the Brinsea OvaScope egg candler.
To see day 15 candling video click here
Sources for the narrative information included on these images:
http://chickscope.beckman.uiuc.edu/resources/egg_to_chick/development.html
Kathy Shea Mormino
Affectionately known internationally as The Chicken Chick®, Kathy Shea Mormino shares a fun-loving, informative style to raising backyard chickens. …Read on
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Regardless of the number of times I have hatched chicks, the process of embryo development fascinates me equally each time. That a chicken egg can evolve from common recipe ingredient into a living, breathing, fluffy-butt in a mere 21 days fits my definition of miraculous.The following photo presentation pairs well-known images from the Purdue Research Institute, depicting embryo development from the inside, with my own photos of candled eggs throughout the 21 chicken egg incubation period.
I invite you to view any one of my YouTube videos to witness the wonder of hatch day. Baby Chick Hatching in Home Incubator, Singing and Dancing Easter Egger, Hatch Day! Ameraucana Chick Arrives! and Hatching Easter Egger.
Egg candling was done using the Brinsea OvaScope egg candler.
To see day 15 candling video click here
Sources for the narrative information included on these images:
http://chickscope.beckman.uiuc.edu/resources/egg_to_chick/development.html
Hi I am a preschool teacher and we are in the process of trying to hatch eggs in our incubator. We had someone come in and candled around 1 week and she said everything looked good. She was in again yesterday which would have been day 16. She said she was not hopeful that the eggs would hatch for she did not see an air sack. What might have caused this?
That was a very interesting post! I never new exactly what was going on in there! Thank you!
Too often! With the really valuable eggs, I'll only candle 2 or three times, usually around day 5-7, then day 14 and 18.
How often do you candle eggs under your broody girls?
How often do you candle them under your girls?