A SECRET WEAPON FOR SWANS INCUBATION PERIOD FOR EGGS

the answer that Mute Swans make use of would be the lay the whole set of eggs after which incubate them when the clutch is complete. The Mute Swan's threat Display screen encompass raising the secondary feathers from the wing, presumably in order to make the chook appear as big and menacing as feasible. minimal harder to candle than goose eggs. a