THE BASIC PRINCIPLES OF FERTILE SWAN EGGS

I'm no skilled on swans. I fairly believe that an evening-time predator filched the eggs. I have heard people today say that their birds( chickens, geese, what ever) eliminate infertile or nonviable eggs from their nest. In 40 several years I haven't experienced a bird take away their unique egg/s with the nest in addition to unintentionally. luvs