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The Black-necked Swan, Cygnus melancoryphus is the largest and 4.5-6.7 kg; females are 102-124 cm and 3.5-4.4 kg. The wingspan is about 177 cm. The body plumage is white with a black neck, head and greyish bill. It has a red knob near the base of the bill and white stripe behind eye. Both sexes are similar, with a slightly smaller female. The cygnet has a light grey plumage with black bill and feet. The Black-necked Swan was formerly placed in monotypic genus, Sthenelides. The smallest member in its genus, it is found in freshwater marshes, lagoon and lake shores in the southern South America.…mehr

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The Black-necked Swan, Cygnus melancoryphus is the largest and 4.5-6.7 kg; females are 102-124 cm and 3.5-4.4 kg. The wingspan is about 177 cm. The body plumage is white with a black neck, head and greyish bill. It has a red knob near the base of the bill and white stripe behind eye. Both sexes are similar, with a slightly smaller female. The cygnet has a light grey plumage with black bill and feet. The Black-necked Swan was formerly placed in monotypic genus, Sthenelides. The smallest member in its genus, it is found in freshwater marshes, lagoon and lake shores in the southern South America. The Black-necked Swan breeds in Zona Sur, Patagonia, Tierra del Fuego and on the Falkland Islands. In the austral winter, this species migrates northwards to Paraguay and southern Brazil.