THE 2-MINUTE RULE FOR HOW MANY EGGS DO SWANS LAY

Is it doable the eggs might be fertile? could it be usual with the eggs for being various shades of green? I know I can search this up within the textbooks, but just how long right until they hatch? this way, the hatchlings will (in principle!) all emerge from their eggs at exactly the same time. like that, the moms and dads will be able to look a