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Himantopus melanurus
It's a species of Charadriiforme bird, from the Recurvirostridae family.
It is found in Argentina, Bolivia, Uruguay, Chile, Brasil and Paraguay.
Some authors think it is a subspecies of Himantopus himantopus or Himantopus mexicanus. Thanks @Malcolm and @Pochempie for ID.
2 Comments
Glad you found the right one.
Pochempie, the Black-winged Stilt (Himantopus himantopus) is a Eurasian bird only. In the Americas it is replaced by the Black-necked Stilt (Himantopus mexicanus), the sub-species of which are being split into separate species by some authorities, so the users names are essentially correct. The original sub-species name was Himantopus mexicanus melanurus, which some authorities are still using.
Try searching for Stilts in your area.