Chicken or the Egg? It was the Egg

“Which came first the chicken or the egg?”. I have the answer

The egg came first

The justification is that according to Darwins theory of evolution the a mutation would have caused the first chicken to evolve from another animal.
Ps I am currently on holiday and was driving down the Cooling in SA when I thought of this. Comments on this would be much appreciated. (I wrote this on my iPhone)