Whether you choose to look at this question from a literal or philosophical point of view, you probably won't arrive at an answer without first being frustrated or utterly confused. But don't worry, you're not alone. In fact, only recently did scientists come forward claiming to have finally "cracked the conundrum of what came first"
I have not read the answer from any scientist to this question.
In fact I didn't know till reading this question....they had come to a conclusion.
That is the honest truth.
But after this answer, I will look it up and see if I have been right,
all this time.
I will be disappointed if I am wrong, because you need to have a 'starting point' with anything in life.It is just common sense.
Oh! Vee, this was just one of the beautiful, picturesque, & magnificent attractions' we saw on our Qantas 'Jetabout' 25 Day 'Tour of NP's of Western America & Canada' in 1983!
Yellowstone NP was just wow! Saw 'Ol' Faithful' erupt on time! Yosemite, aaah Yosemite, just breathtaking! 'The Rockies' with their Glaciers & towns galore....Banff, Jasper, Calgary, Vancouver! I must stop now, or I'll get too carried away!
I believe the egg came first. A chicken hatched from it, but a chicken didn't lay it.
Posibly a genetic mutation. Maybe a whole clutch of genetic mutants that evolved into something humans could easily catch and domesticate.