DETAILS, FICTION AND GESTATION PERIOD FOR SWAN EGGS

I'm no pro on swans. I rather feel that an evening-time predator filched the eggs. I have listened to men and women claim that their birds( chickens, geese, what ever) get rid of infertile or nonviable eggs from their nest. In forty yrs I haven't had a hen clear away their very own egg/s from your nest aside from accidentally. How many swan eggs d