Beautiful eggs

Now I have urge to do research in bird genitals
But then I'd start telling everyone and bird genitals cause I love sharing knowledge
And they will ask me why I know so much about bird genitals and I'll have to tell them I have done research on bird genitals
I can't stop saying bird genitals

The only birds that I know for sure have them are waterfowl like ducks and swans.

But how do the others reproduce? (And don't tell me it's the stork)