SWAN EGGS HATCHING TIME SECRETS

I am no expert on swans. I somewhat think that a night-time predator filched the eggs. I've read people today say that their birds( chickens, geese, whichever) take away infertile or nonviable eggs from their nest. In forty a long time I have never had a fowl take out their very own egg/s with the nest besides accidentally. To do this, the pen del