About Sporophila caerulescens (Vieillot, 1823)
This species is sexually dimorphic. Males have a gray head and gray back, a black collar around the throat, and a second black band across the upper whitish breast positioned just below the collar. They have gray legs, a medium-length tail, and a stout bill adapted for eating seeds. Females are less colorful in appearance. The species' range extends from central Argentina, east of the Andes cordillera, northward through Bolivia and Paraguay, and northeastward into south-central Brazil and southeast coastal Brazil. It retreats into Amazonia during the austral winter. The double-collared seedeater only occurs in the southern Amazon Basin, with the Amazon River forming its northern range limit. In the western Amazon Basin, it is found in eastern regions of Peru, specifically in areas around the Ucayali River, and mostly occurs on the eastern bank of this north-flowing river. In the southeast of the Amazon Basin, its range extends from the Cerrado into the upstream two-thirds of the north-flowing Araguaia-Tocantins River drainage system.
