According to Philosophy which comes first egg or chicken?

Our best answer to that question derives from evolutionary Biology. The chicken evolved from some previous species of bird which resembled a chicken but wasn't quite a chicken. The first chicken egg would have been laid by another species, which we might call a proto-chicken, therefore the egg came first. For those who prefer a biblical explanation, the chicken would have come first since God (as far as we can tell) initially created animals in their adult forms, not in the form of eggs or other immature forms.