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
thank you for these photos. I have eggs under a hen at day 18. Hen's comb and waddles are very pale so I thought I might as well check to even see if the eggs are developing. well they are banny eggs and I don't have a small enough flashlight to have the egg cover it completely but I did cup my hand around the excess light, but all I could see was the air sac I am assuming. light only went through the end of both eggs. I thought I would be able to see movement or something. is… Read more »
Thank you for the great photos I showed them to my five year old to show her how the chicks develop in the eggs since we are hatching them in the incubator at home for the first time, she thought it was awesome to learn how they are growing in the eggs!
I just showed this to my sister since she just experienced a 4-5 day-er. Thanks for this awesome resource. I guess maybe just a negligent worker, or one fell through the system?
YOUR AWESOME WE HAVE CHICKENS IN OUR SCHOOL COME VISIT AT PS347
This was so helpful in determining on what day my chicks perished when doing eggtopsy today. I had a couple very late deaths, like day 17 that I eggtopsied today. I was unsure exactly how old until I looked at your photos. I had a temp spike right at lockdown, so it's all coming together.