There will be an exact egg that contains the first chicken (defined as an animal that can fuck other chickens and produce offspring IIRC), that came before the first chicken because the chicken was in the egg.
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).
The egg. The first “chicken egg” was laid by a bird that was not a chicken.
At that point the genetic difference would be too small to not call that bird some sort of chicken.
Then go one generation further back until the laying bird statisfies your “not chicken” criteria.
Nope.
There will be an exact egg that contains the first chicken (defined as an animal that can fuck other chickens and produce offspring IIRC), that came before the first chicken because the chicken was in the egg.
I’m no biologist, but I’m pretty sure this ignores how fluid the evolution is from regular bird to proto-chicken to chicken.
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.