AN UNBIASED VIEW OF SWANS EGGS INCUBATION TIME

I'm no qualified on swans. I alternatively imagine that an evening-time predator filched the eggs. I have listened to people declare that their birds( chickens, geese, whatever) remove infertile or nonviable eggs from their nest. In forty several years I haven't had a fowl take out their very own egg/s with the nest other than accidentally. eventu