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Black-necked swan
The black-necked swan (Cygnus melancoryphus) is a species of South American waterfowl in the tribe Cygnini of the subfamily Anserinae. It is found in Argentina, Brazil, Chile, Uruguay, and the Falkland Islands. The black-necked swan is the smallest true swan on average, weighing between 3.5–8.7 kg (7.7–19.2 lb) as adults, but it is still the largest species of waterfowl native to South America. Taxonomy and systematicsThe black-necked swan has occasionally been placed by itself in the genus Sthenelides.
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