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Black‑and‑rufous warbling finch, Gray‑throated warbling finch, Buff‑throated warbling finch, Pampa finch, Black‑capped warbling finch
The long-tailed reed finch (Donacospiza albifrons) is a species of bird traditionally placed in the Emberizidae family. It has been suggested though that its nearest relations may be the finch-like tanagers of the genus Poospiza in the family Thraupidae. It is the only member of its genus, Donacospiza.
It is found in Argentina, Bolivia, Brazil, Paraguay, and Uruguay. Its natural habitats are temperate grassland, subtropical or tropical seasonally wet or flooded lowland grassland, and swamps.
Long-tailed reed finch Wikipedia