THE BASIC PRINCIPLES OF FERTILE SWAN EGGS

I am no expert on swans. I rather imagine that an evening-time predator filched the eggs. I've heard people today declare that their birds( chickens, geese, no matter what) remove infertile or nonviable eggs from their nest. In 40 many years I have not experienced a chook take away their own personal egg/s from the nest apart from unintentionally.