science is inexact in listing what constitutes a species. if the animal meets criteria like two wings a beak two legs etc, then it is a chicken. the problem is that this is an inexact science. it is sufficient for everyday use, sure. but a line has to be drawn. how do we draw it?
the lithmus test to define chicken should be that any ancester chicken that can successfully breed with a current chicken, is a chicken.
so which came first? the egg. if you go back in time we will find the first closest relative chicken that can mate succesfully with a modern chicken. that first ancester chicken came in the form of an egg. it is impossible to know which chicken came first as we can’t for a practical matter mate all ancesters with all modern chickens, but in principle we know that there is an ‘earliest chicken’ and that it came in the form of an egg.
The Law of Love 
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