NOT KNOWN FACTUAL STATEMENTS ABOUT SWAN EGGS TO HATCH

I am no expert on swans. I fairly imagine that an evening-time predator filched the eggs. I have heard people today claim that their birds( chickens, geese, regardless of what) eliminate infertile or nonviable eggs from their nest. In 40 many years I haven't had a chook get rid of their own egg/s in the nest besides accidentally. All of our swans