Rusty-backed Antwren
Formicivora rufa
The rusty-backed antwren is 12 to 13 cm (4.7 to 5.1 in) long and weighs 11.5 to 14 g (0.41 to 0.49 oz). The males of all three subspecies have a tawny rufous crown and upperparts. They have a white supercilium and the rest of the face and the throat are black. The middle of the breast is black with a white edge separating it from the cinnamon-buff flanks; the belly is white. The folded wings show lines of white dots. The tail feathers are black with chestnut fringes, white sides, and white tips. The nominate female has paler rufous upperparts than the male. Voice: The rusty-backed antwren's song is "a long rattle of evenly pitched harsh or sharp notes, often increasing in intensity" that appears to vary geographically. Common calls are "an explosive or strident 'chip cheep' or 'tit-tweep'".
ID text from Wikipedia, CC BY-SA 4.0
Southern White-fringed Antwren
Formicivora grisea
The southern white-fringed antwren is 12 to 13 cm (4.7 to 5.1 in) long and weighs 9 to 12 grams (0.32 to 0.42 oz). Adult males of the nominate subspecies have a white supercilium that extends down the neck, along the side of the breast, and widens on the flanks. Their crown and upperparts are dark grayish brown with white edges on the scapulars and a hidden white patch between them. Their wings are brownish black with white tips on the coverts. Their tail is black with white feather tips that increase in size from the central to the outer feathers. Voice: The southern white-fringed antwren has several vocalizations. The "monotone song" is a "single soft chup note repeated...as many as 50 notes". Another is an "extremely variable complex note...churet or chuweet. A third is "kip-chrup liquid phrase of two well-spaced notes". There are some minor geographic variations. Both sexes sing, typically when hidden in foliage, and mostly in the morning.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Rusty-backed Antwren and Southern White-fringed Antwren.