Eggs: What the hell are they?

Was thinking tonight about eggs. We eat eggs. But what the hell are they? I couldn’t sleep from thinking about it. so I had to get up in bed and make a note. it is such a gross thought when you really just start thinking about it. an egg... isn't that the fetus of an animal? So where the hell is the animal? I think its like the unfertilized egg of an animal, something like that. totally gross when you think about it. The worse part is that I love eggs. But who the hell thought of this crazy idea? and why don't we eat the eggs of other animals as well? other birds like turkeys or other birds? Man that would be weird. Why just the chicken? Face it, the idea of us eating the eggs of other animals is just plain fucking weird.