as you know eggs can vary a bit in moisture loss, perhaps this one was just a tad more than the other, if the chick looks good dont worry about it! you already know sand is an issue, when its wet!
I wonder if the fact it was caked in mud and poo has something to do with it. And the lack of moisture loss.
#5 is out in a puddle of blood... I think it forced it's way out a bit early. Because of the other 3 playing soccer. It's yolk is fully absorbed.
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