I would like to announce that I have solved the chicken-or-the-egg problem:
An egg is a chicken.
Think about it. A fertilized egg is a single cell with complete chicken DNA. When a chick breaks out of its egg, it’s really just shedding a layer of itself, the way scorpions molt from their old skin.
(Of course, this still begs the question of whether the first chicken appeared as an egg or an adult, or something in-between. But putting it that way is not nearly as compelling.)