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would a yolk so big hatch out a super chick? does it work that way?
would the hen (if it is) lay really big eggs?
why don't you try it and let us know.
can you put a strong flashlight under it and see if there are two yolks?
There is a tread and video of someone who hatched a double yolk.
I think it is a sticky on the index.
for your poor hen!