Repenning and Fontana, 2013,
Rio Tainas Valley, 28°52’43.2” S, 50°27’34.7” W, 708 m asl, Jaquirana, Rio Grande do Sul, Brazil.
Yellow-billed birds found in extreme S range of (and otherwise largely resembling) S. plumbea have been assigned to that species for the best part of two centuries, but were recently shown to represent a distinct species, differing in their yellow vs black bills (3); bluish-grey vs plumbeous-grey plumage in male (1); larger size (effect size for bill height from published data#R 2.49, score 2); distinct habitat (grasslands with greater shrub density on dry and steeply sloping terrain vs grasslands with scattered sub-shrubs associated with mesic environments near poorly drained and flatter soils (1); song like plumbea’s but with clear (whistled) introductory syllables and unique call notes#R (at least 2). Monotypic.
Araucaria forests of S Brazil (Paraná S to Rio Grande do Sul); migrates N to cerrado savannas of C Brazil (E Goiás, W & C Minas Gerais, SW Bahia)#R.
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