Myrmidien à bords roux

Identification

The rufous-margined antwren is 10 to 12.5 cm (3.9 to 4.9 in) long. Adult males have a black crown and nape, a wide whitish supercilium, a black stripe through the eye, and black and white or pale yellow mottled ear coverts. Their upperparts are mostly olive-gray with scattered black patches, yellow uppertail coverts, and white tips on their outer scapulars. Their wing coverts are black with white tips; their flight feathers are olive-brown tinged dark gray with bright cinnamon-rufous edges. Their tail is mostly dark gray with white tips on the feathers and an entirely white outermost pair. Their throat and underparts are light yellow with an olive tinge on the sides. Adult females have a rufous forehead, a rufous-brown crown, and an olive-brown back. Their wings, tail, and underparts are like the male's.

Taxonomie

Nom scientifique

Herpsilochmus rufimarginatus

Autorité

(Temminck, 1822)

Ordre

Passériformes

Famille

Thamnophilidés

Genre

Herpsilochmus

Répartition et habitat

The rufous-margined antwren has a disjunct distribution. A small population is found north of the Rio São Francisco in Brazil's Pernambuco state. The other population is found from Bahia in southeastern Brazil south into Paraguay and northeastern Argentina. It primarily inhabits the interior of humid evergreen Atlantic Forest, less often its edges, and locally in restinga woodlands on white-sand soils. It typically is found from the forest's mid-storey to its subcanopy and favors dense vine tangles. In elevation it ranges from sea level to about 1,100 m (3,600 ft).

Aire de reproduction

SA : e, se Brazil, e Paraguay and ne Argentina

Aire hors reproduction

ENG

Migration

Resident species

Comportement

The rufous-margined antwren is thought to be a year-round resident throughout its range.<p>The rufous-margined antwren's diet has not been detailed, but is known to be primarily insects and also includes spiders. It has also been seen feeding on Rapanea mistletoe berries. It forages actively and methodically, and usually captures prey by gleaning from leaves, stems, and vines by reaching and sometimes lunging from a perch. It occasionally makes short sallies to glean from the underside of leaves. It is not known to follow army ant swarms.<p>Nothing is known about the rufous-margined antwren's breeding biology.<p>The rufous-margined antwren's song is "3‒4 slow-paced notes which rise in frequency, after which a series of fast notes gradually decelerates and drops again in pitch". Pairs often sing in duet. Its most common call is a "melodious whistled note tew" that may be repeated up to five times in a burst or irregularly over a longer period. It also makes a "short trill of short overslurred notes at flat pitch". The species is vocal year-round, usually singing during the day and from the forest canopy.

Conservation

Tendance de la population

stable