Black-bellied Antwren
Formicivora melanogaster
The black-bellied antwren is 12 to 14 cm (4.7 to 5.5 in) long. Adult males of the nominate subspecies have a wide 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 outer scapulars and a hidden white patch between them. Their wings are blackish 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. Their face, throat, and underparts are black with white underwing coverts. Voice: The black-bellied antwren's song is a "slow series of high, nasal 'tjew' notes (2/sec over 8 sec)". Its calls may vary geographically and include "a short series of complaining squeals...also sharp high-pitched 'seek' notes and lower-pitched, short downslurred notes".
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: Black-bellied Antwren and Southern White-fringed Antwren.