What I found surprising is that there's only a 15 minute window (in the infindibulum) where fertilization can occur. But the chicken still goes through all the steps of forming a complete egg even if no fertilization happens, which seems like a pretty likely outcome if the window is so short. That seems surprisingly wasteful from an evolutionary perspective. Is this due to humans breeding chickens to be more reliable egg layers, or is there some other reason I don't understand? Maybe in the wild, successful fertilization is more of a sure thing than it sounds?