SWANS EGGS INCUBATION TIME NO FURTHER A MYSTERY

can it be feasible the eggs is going to be fertile? could it be regular to the eggs to generally be different shades of green? I know I'm able to glimpse this up in the textbooks, but how much time till they hatch? As Beforehand outlined, the pen will leave the nest from time to time, and when this occurs, the cob Typically will take his activate