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At which point does an egg of non-chicken become an egg of chicken?
Chickenness is a spectrum, not a binary
Is archeopteryx a chicken?
I’ve never seen one run from a fight.
That’s quite controversial.
Doesn’t matter as it’s not a stated in the question. It just needs to be an egg.
When genetic mutation happened between non-chicken and its egg to create real chicken
When first chicken lay egg, duh!
Unless you define a chicken egg as an egg of which a chicken is born (or of which a chicken could be born)
