Why do my ducks lay small eggs?

[Nananola]

Why do my ducks lay small duck eggs once in a while. The egg we got this morning is about the size of a quarter?

 

[Sosalty]

I could only guess. The bright side is for eggs, you have lots of chicken stuff to pick from as needed. Weather, duck breed, and feed would play a role.

 

[nuthatched]

Their called fairy or fart eggs. They're just glitches.