Looks like being Sporophila corvina, Variable Seedeater. Formerly it was called Sporophila americana or Sporophila americana corvina. I think Sporophila corvina is the actual taxon.
https://en.wikipedia.org/wiki/Sporophila_corvina
http://avibase.bsc-eoc.org/species.jsp?avibaseid=53BF86BF5C97B8C5
http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=623436
http://ibc.lynxeds.com/species/variable-seedeater-sporophila-corvina
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