Large-billed Antwren
Herpsilochmus longirostris
Small active antwren of the middle to upper levels of woodlands and dry forests. Males are gray with a black cap, a black white-tipped tail, and black wings with white bars. Differs from male of Black-capped Antwren in having gray spots on the otherwise pale breast. Females are very different from Black-capped Antwren in having a rufous head, breast, and belly.
Identification
The large-billed antwren is 12 to 13 cm (4.7 to 5.1 in) long and weighs 12 to 14 g (0.42 to 0.49 oz). As its English name and specific epithet imply, its bill is heavier than those of most other Herpsilochmus antwrens. Adult males have a black crown and nape, a long whitish supercilium, a narrow black streak through the eye, and grayish ear coverts. Their back and rump are gray with a black and white patch between the scapulars and white-tipped black uppertail coverts. Their wings are black with white-tipped coverts and flight feathers with white edges towards the end. Their innermost tail feathers are black with white edges, the outermost entirely white, and those in between black with white tips. Their throat and underparts are mostly white with tiny black spots on the sides of the breast and grayish sides and flanks. Adult females have a rufous-cinnamon crown, cinnamon-tinged gray ear coverts and upperparts, and cinnamon neck, throat, and underparts. Their wings and tail are like the male's.
Taxonomy
The large-billed antwren was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name Herpsilochmus longirostris. Its relationship to others of its genus is unclear but it apparently is most closely related to the pectoral antwren (H. pectoralis), and at least one author has considered them to form a superspecies.<p>The large-billed antwren is monotypic.
- Scientific name
- Herpsilochmus longirostris
- Authority
- Pelzeln, 1868
- Order
- Passeriformes
- Family
- Thamnophilidae
- Genus
- Herpsilochmus
Range and habitat
The large-billed antwren is found south of most of Amazonia. It occurs in the northern parts of Bolivia's Beni and Santa Cruz departments and in south-central to northeastern Brazil. Its Brazilian range is roughly bounded by the states of Mato Grosso, Tocantins, and Paraná though it is found locally as far northeast as southern Ceará and Piauí. It inhabits deciduous and semi-deciduous forest, gallery forest, and palm groves, and does not favor any particular level of the forest. In Bolivia it also often inhabits small patches of forest in otherwise open cerrado. In elevation it ranges from about 150 to 1,100 m (500 to 3,600 ft).
- Migration
- Resident species
Behavior
Migration pattern: Resident species.
Conservation
Population trend: declining.
- Population trend
- declining
Photos
Distribution
Bird Calls
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