how to find a sole egg layer amongst chickens, ducks, and geese?

[bravevline]

 

[chfite]

Is the egg in question a chicken egg, a duck egg, or a goose egg?

Chris

 

[bravevline]

i already know they are duck eggs.

 

[bravevline]

i wasnt sure rather they were duck eggs or chicken eggs but i know who is doing it now