AN UNBIASED VIEW OF SWANS EGGS INCUBATION TIME

I'm no pro on swans. I fairly feel that a night-time predator filched the eggs. I have heard individuals say that their birds( chickens, geese, no matter what) take away infertile or nonviable eggs from their nest. In 40 many years I have not experienced a fowl take away their particular egg/s within the nest in addition to unintentionally. Eggs l