The rufous-margined antwren is an insectivorous bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds." It is found in Argentina, Brazil, and Paraguay.
Region
Atlantic Forest of Brazil, eastern Paraguay, and northeastern Argentina
Typical Environment
Occupies humid evergreen and semi-deciduous forests, including interior, edges, and well-developed secondary growth. Also occurs in gallery forests and wooded corridors within savanna mosaics. Typically forages in the midstory to upper understory among vine tangles and foliage. It is a forest-associated species but shows some tolerance for disturbed habitats if tree cover remains.
Altitude Range
0–1200 m
Climate Zone
Subtropical
Ease of Keeping
Beginner friendly: 1/5
This small antbird is often found in pairs and frequently joins mixed-species flocks while foraging. Its name comes from the warm rufous edging on its wing feathers. Pairs commonly perform duets, and both sexes help raise the young. Though affected by forest loss, it can persist in secondary forests and gallery woodlands.
Temperament
active and alert, often in pairs
Flight Pattern
short rapid wingbeats with quick dashes between perches
Social Behavior
Typically seen in pairs that maintain small territories and regularly join mixed-species flocks while foraging. The nest is a small cup placed in low to mid-level vegetation; both parents incubate and feed nestlings. Courtship and territory maintenance often involve duetting.
Migratory Pattern
Resident
Song Description
A series of high, thin whistles that accelerate slightly, often delivered as antiphonal duets between pair members. Calls include sharp chips and soft tsits used for contact within mixed flocks.
Plumage
Active, slim antwren with fine, slender bill; males are mostly gray with darker wings and tail edged rufous, while females are warmer brownish with similar rufous margins. Underparts are pale gray to buff. Feathers show neat rufous edging on wing coverts and tertials that creates the species’ namesake margining.
Diet
Feeds mainly on small arthropods such as insects and spiders. Gleans prey from leaves, twigs, and vine tangles, and occasionally makes short sallies to snatch flying insects. Foraging is brisk and methodical, moving through foliage in pairs or with flock companions.
Preferred Environment
Midstory to lower canopy of humid forest, especially in areas with lianas and dense foliage. Also uses forest edges and mature secondary growth where continuous cover is available.
