BLACK SWAN CYGNETS at Kellogg Bird Sanctuary. Generally, black swans nest in the wetter winter months(Feb. to Sept.) native to Australia and adjacent coastal islands. A clutch contains 4to8 greenish-white eggs ,incubated for about 35 to40 days. After hatching, the cygnets are tended to by the parents for about 6 months ,until fledging.....REF..Wikipedia..Black Swan