Black-necked swan (Cygnus melancoryphus) is a waterfowl that is native to southern South America, including Brazil, Paraguay, Argentina, Chile, South Georgia, and the Falkland Islands. This species is known to be traded and bred as an ornamental pet, however there is no evidence of this species ever having become established outside its native range. No specific information was found regarding trade volume or duration. The history of invasiveness is classified as No Known Nonnative Population. The overall climate match category for the contiguous United States was High. Virtually all the contiguous United States had a medium to high local climate match. With the lack of introductions outside of its native range and the confusion regarding distribution of established populations
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