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this post was submitted on 17 Apr 2026
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As best I understand it, the chick to be doesn't grow in the yolk, but on it. What is left of the yolk is still attached to the chick when it hatches, and acts as a food supply for the chick for about 3 days. This is one of the reasons newly hatched chicks can be shipped through the mail. I would posit that eggs have evolved to grow chicks in the middle for the same reason hens turn their eggs regularly, to prevent long term blood flow loss to whatever part of the body the chick's weight would be on. Growing closer to the middle of the eggs will let the Lil chicks to float for as long as possible before starting to rest weight on the "down" side of the shell.
Edit: I dont think the yolk has internal structures.