NOT KNOWN FACTUAL STATEMENTS ABOUT SWAN EGGS TO HATCH

I'm no specialist on swans. I fairly believe a night-time predator filched the eggs. I have read people express that their birds( chickens, geese, regardless of what) clear away infertile or nonviable eggs from their nest. In 40 a long time I have not experienced a bird clear away their own egg/s in the nest aside from accidentally. To achieve thi