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I'm no biologist, but I'm pretty sure this ignores how fluid the evolution is from regular bird to proto-chicken to chicken.
By the well ordering theorem, no matter what you choose as your definition of "chicken", there must be a first.
Not really there is a well defined line that defines what is/isn't a chicken, that's really the only thing needed for this question.
The issue is the term proto-chicken isn't well defined.
But for it to be considered a different species it would have to not be able to reproduce with a modern chicken (which doesn't mean it can't reproduce with early chickens).
You'll have no problem citing the exact definition then.
The exact definition doesn't matter though, every chicken whether the first or the last, or from the blurry zone between proto-chicken and chicken, has many much older eggs in it's ancestry. Probably somethig fish something.
The point is that there's no single generation where the species went from not a chicken to a chicken. That's not how evolution works
No the point is exactly what i think , in exactly the way that i think it. I understand exactly entirely and completely how evolution works. /s
Revolitionary single mutations do occure sometimes and can mean speciation, so in some cases, there can be one individual that is the true first of the new species.
https://en.wikipedia.org/wiki/Chicken
https://en.wikipedia.org/wiki/Red_junglefowl
https://en.wikipedia.org/wiki/Species
The first two links are irrelevant because they describe physical characteristics and not a well defined line. The quotes you copied are vague descriptions at best.
The last quote you emphasized says "it can be defined" which shows it's not a well defined line. Also, there are quite a few cross-species hybrids that have produced fertile offspring.
Here's a list of some
These birds aren't even in the same family and have hybridized
The concept of a species is a lot more flexible and less-defined than you think.