Concepción del Paraguay, Paraguay.
Taxonomy complex, requiring further research; hitherto included S. griseus and its various races, which, when lumped with present species, comprised two out of five groups differentiated on size and plumage. Remaining three groups in fact consist of four when vocal characters added#R: former “griseicapillus group” (breaks into two, “amazonus group” and “griseicapillus group”) of Amazonia and Chaco, monotypic “reiseri group” of NE Brazil, and “sylviellus group” of E & SE South America. These groups may, on rigorous investigation, each represent species. Proposed race viridior, from E Bolivia, barely distinguishable from viridis, perhaps reflecting intergradation between latter and nominate. Eight subspecies recognized.
Food and feeding
Status and conservation
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