The Yellow-chevroned Parakeet (Brotogeris chiriri) is native to tropical South America south of the Amazon River basin from central Brazil to southern Bolivia, Paraguay and northern Argentina.
This map shows their range. They are very easily found in the Pantanal. The photo above was taken in the grounds of Pousada Piuval last September. Yellow-chevroned Parakeets usually find holes in trees to nest in. They will also form nesting tunnels in dead palm fronds. It lays 4-5 eggs. After raising its young, all birds will form rather large communal roosts until the next breeding season.
This video shows what a pleasant chirp they have!