| Chestnut-shouldered antwren | |
|---|---|
 | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Thamnophilidae |
| Genus: | Euchrepomis |
| Species: | E. humeralis |
| Binomial name | |
| Euchrepomis humeralis (Sclater, PL &Salvin, 1880) | |
 | |
| Synonyms | |
Terenura humeralis | |
Thechestnut-shouldered antwren (Euchrepomis humeralis) is a species ofbird in subfamily Euchrepomidinae of familyThamnophilidae, the "typical antbirds". It is found inBolivia,Brazil,Ecuador, andPeru.[2]
The chestnut-shouldered antwren wasdescribed by the English ornithologistsPhilip Sclater andOsbert Salvin in 1880 and given thebinomial nameTerenura humeralis.[3] There it remained until the current genusEuchrepomis was created in 2012 followingphylogenetic analysis.[4]
The chestnut-shouldered antwren ismonotypic.[2]
The chestnut-shouldered antwren is 9.5 to 11 cm (3.7 to 4.3 in) long and weighs about 7 to 8 g (0.25 to 0.28 oz). The sexes have different plumage. Adult males have a whitishsupercilium and a thin dark line through the eye on an otherwise pale gray face. Their crown and nape are black, their back greenish olive, their rump rufous-chestnut, and their uppertailcoverts and tail grayish olive. Their wing coverts are blackish gray with whitish tips that form two bars on the closed wing, their flight feathers olive-tinged blackish gray with pale olive-yellow edges, and the bend of the wing rufous-chestnut. Their throat and breast are pale gray and their belly and undertail coverts are pale yellow. Adult females have an olive-brown crown, nape and eyeline, a pale gray supercilium, and dark olive-brown wings with at most a trace of chestnut at the bend.[5][6]
The chestnut-shouldered antwren is found from eastern Ecuador and eastern Peru south of theRio Napo south into northwestern Bolivia and east in Brazil through northernRondônia and intoAmazonas state as far as theRio Madeira. It inhabits the subcanopy and canopy ofterra firme and drier floodplain tropical evergreen forest.[5][6][7]
The chestnut-shouldered antwren is believed to be a year-round resident throughout its range.[5]
The chestnut-shouldered antwren feeds onarthropods, though details of its diet are lacking. It typically forages in pairs or small family groups that usually joinmixed-species feeding flocks. It forages almost entirely in the forest canopy, acrobatically gleaning prey from leaves and the ends of branches.[5][6][7]
Nothing is known about the chestnut-shouldered antwren's breeding biology.[5]
| Songs and calls |
The chestnut-shouldered antwren's song is "very high, thin, slightly descending, gradually accelerating to a 'fuh-fuh-weet-weet-d-rrr' rattle".[7]
TheIUCN has assessed the chestnut-shouldered antwren as being of Least Concern. It has a very large range but its population size is not known and is believed to be decreasing. No immediate threats have been identified.[1] It is considered fairly common in most of its range and occurs in several protected areas.[5]
