mirage des oeufs jour par jour (source https://www.backyardchickens.com/threads/chicks-are-here-egg-candling-pics-progression-though-incubation.261876/)
0 hrs Note that with a bight enough light you can see though brown and green eggs easily. Shell thickness and egg size will impact image quality, so note these are bantam eggs.
This is a great example of a porous egg, not ideal for hatching.
28hrs Not much to see though the egg at this point. If you were to open the egg and look at it under a dissection microscope, you'd see that the head/neural fold has formed, and up to 4 pairs of somites. (Somites are mesodermal cells which migrate and give rise to tissues such as muscle, bone, and cartilage. Note the number on the egg, it serves as tracking and to know which side is "up" as I am hand turning 3x a day.
52 hrs If you look closely, you can see the start of the blood island in the middle of the egg. The heart is actively beating by this time and has started to turn; the heart starts out as a tube during development.
May be easier to see after photoshop, it's that darker ring on top of the yolk shadow
76 hrs At this point, limb buds have not only formed but are enlarging and the eye is beginning to become pigmented.
Some photo editing and you can really see the veins!
Schematic
100 hrs The limbs are now starting to look like limbs and the embryo starts to look like what a common person would say is an embryo.
Enhanced to see veins
Day5 On this day, the beak has just become viable and the chick's limb buds are no longer buds and instead will have identifiable digits! The black dot is the eye.
Edited to enhance veins
A day 3 or so quitter
Profile view and you can see the veins in my finger too.
Day6 It gets harder to take clear vein pics, as there is enough vascularization that it gets a bit washed out.
Enhanced image.
Embryo Movement Clip
Day 7 If you were to open them up, you'd see little specks where future feathers would emerge!
Day 8
Day 9
Day 10
Day 11
Video
Day 12
Day 13 If you opened them up, you'd see claws forming!
Day 14 It's so dark there is pretty much nothing really to see! Just a bit of space left
Day 15
Video
Day 16 You can see toes in the second one!
Toes video
Day 17
Day 18 Lock down!!!! Since there is plenty of space in the bator, I made little paper cups to put each egg in. Hopefully this will catch the majority of the hatch junk left over from popping out so clean up is a bit easier.
HATCH DAY Note, there is no plan to open the bator for the next 48 hours. The top is clear so all the action can be seen without compromising the hatch!
Pips
First to hatch: About 14 hours after the first pip at 4am. Note the clean hatch and absence of any blood in the shell. It was ready!
Hatch Video
Second to hatch: About 17 hours after the pip at 4am. Could have piped any time between 11pm and 4 am though. Another clean hatch.
par 
Sujet: Le mirage des oeufs jour par jour : 
