Here is a drawing of a ten day old chicken embryo. If we were able to peer inside of an egg right now, the embryo would be starting to fill up the space, and it is almost halfway through its development. It really starts to look like a chick now! Still, the photos can be hard to look at, so I made you this drawing to check out instead.
Feather follicles are starting, and the egg tooth and beak become prominent.
At this point in the development, the egg shell becomes more porous, to let in more oxygen. It's important to only handle the eggs with very clean hands now, so that germs and bacteria cannot make their way inside.
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