Warbling Doradito

The warbling doradito is 11 to 12 cm (4.3 to 4.7 in) long and weighs 7 to 8 g (0.25 to 0.28 oz). The sexes have the same plumage. Adults have a mostly dull olive-brown head and upperparts. Their crown is rufescent, their lores and cheeks are dusky, and their tail is dusky olive-brown. Their wings are dull olive-brown with light buffy edges on the flight feathers and tips on the wing coverts; the last show as two faint wing bars. Their throat is bright yellow and their underparts 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; females have a mostly black bill with a pale pinkish base to the mandible. Juveniles are duller overall than adults; their wing bars are a deeper buffy, their throat grayer, their breast bright buffy, and their belly creamy yellow.

The warbling doradito is found from central Paraguay south to Buenos Aires Province in Argentina and east through Uruguay and in southern Brazil's Santa Catarina and Rio Grande do Sul states. It primarily inhabits reedbeds, freshwater and sawgrass marshes, and riparian vegetation. In the non-breeding season it also occurs in somewhat dryer grassy areas. In elevation it ranges between sea level and 500 m (1,600 ft).

The warbling doradito's diet has not been detailed but is known to be primarily insects. It forages singly or in small family groups, typically low and deep in the vegetation. It takes prey mostly by gleaning while perched and occasionally with short flights to hover-glean.