About Pseudocolopteryx flaviventris (Orbigny & Lafresnaye, 1837)
The warbling doradito (Pseudocolopteryx flaviventris) measures 11 to 12 cm (4.3 to 4.7 in) in length and weighs 7 to 8 g (0.25 to 0.28 oz). Males and females have identical plumage. Adult warbling doraditos have mostly dull olive-brown heads and upperparts, with a rufescent crown, dusky lores and cheeks, and a dusky olive-brown tail. Their wings are also dull olive-brown; flight feathers have light buffy edges, and wing coverts have light buffy tips that form two faint wing bars. Adults have a bright yellow throat, with underparts that are a slightly less bright yellow. Both sexes have a medium brown iris and dark gray legs and feet. Males have a slender, black, warbler-like bill, while females have a mostly black bill with a pale pinkish base to the mandible. Juveniles are duller overall than adults, with deeper buffy wing bars, a grayer throat, a bright buffy breast, and a creamy yellow belly.
The warbling doradito is distributed from central Paraguay south to Buenos Aires Province, Argentina, east through Uruguay, and into the southern Brazilian states of Santa Catarina and Rio Grande do Sul. It primarily lives in reedbeds, freshwater marshes, sawgrass marshes, and riparian vegetation. During the non-breeding season, it can also be found in somewhat drier grassy areas. It occurs at elevations ranging from sea level up to 500 m (1,600 ft).
