AN UNBIASED VIEW OF FERTILE SWAN EGGS FOR SALE

I'm no specialist on swans. I rather imagine that an evening-time predator filched the eggs. I have heard people state that their birds( chickens, geese, regardless of what) take out infertile or nonviable eggs from their nest. In 40 several years I haven't had a chook take out their own individual egg/s within the nest apart from accidentally. Sw