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Amazonian Scrub-Flycatcher Sublegatus obscurior Scientific name definitions

Mark B. Robbins
Version: 1.0 — Published March 4, 2020
Text last updated January 1, 2004

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Introduction

Amazonian Scrub-Flycatcher is a widespread songbird of lowland northern South America.  Found throughout the Orinoco and northern Amazon drainages, the species inhabits edges of terra firme forest as well as adjacent clearings.  It is olive above with blackish wings edged in buff, whitish supercilium, and a gray throat that blends into dull yellow underparts.  Amazonian Scrub-Flycatcher is similar to the Northern Scrub-Flycatcher but has duller underparts with less contrast.  The song, a repetitive two-part whistle, can be useful in detecting this uncommon flycatcher.

Field Identification

14 cm; 14·5–17 g. Has faint, thin pale supercilium; dark greyish-brown above, wings dusky grey with indistinct greyish to whitish wingbars; tail dusky; chin, throat and upper breast dark, dusky grey, abdomen dingy yellow; iris dark brown; bill short, stubby, black; legs grey. Distinguished from congeners by darker plumage overall, darker grey of throat grading into duller yellow underparts, lacking sharp demarcation between breast and belly. Sexes alike. Juvenile not described.

Systematics History

See S. arenarum; for vocal differences from S. modestus see below. Monotypic.

Subspecies

Monotypic.

Distribution

Amazonia from E Colombia, S Venezuela and the Guianas S to E Ecuador, E Peru, N Bolivia and NC Brazil (S to N Mato Grosso (1) and E to Paragominas area (2), NE Pará).

Habitat

Scrubby clearings and forest and river edge, from sea-level to at least 450 m; locally to 900 m at base of E Andes. Typically in more mesic habitats than those preferred by congeners.

Movement

Resident.

Diet and Foraging

Arthropods; probably also small berries. Forages inconspicuously in shrubs and small trees, perching upright with tail vertically downwards; makes long pauses and peering head movements; food items obtained by outward hover-gleans to vegetation and short aerial sallies.

Sounds and Vocal Behavior

Dawn song a loud, repeated phrase of 2–3 syllables, “ch-we-deé ch-we-deé chu-weeé”, third syllable upslurred and not always given during each bout; call note “jeeer”, more burry and drawn out than that of S. modestus, lacking squeaky quality of S. arenarum call.

Breeding

Enlarged testes and song during Jul, and nest-building in late Jul, in Ecuador; enlarged testes during Mar in Guyana. Nest is open cup in fork of horizontal branch, c. 8 m above ground, No other information.
Not globally threatened. Local and apparently rare to uncommon, although easily overlooked because of inconspicuous behaviour. Occurs in La Selva Lodge, in Ecuador, Tambopata-Candamo Reserved Zone, in Peru, and Madidi National Park, in Bolivia. Has probbly increased, and will continue to do so, with degradation of primary forest; elevational range may increase with degradation at base of E Andes.
Distribution of the Amazonian Scrub-Flycatcher - Range Map
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Distribution of the Amazonian Scrub-Flycatcher

Recommended Citation

Robbins, M. B. (2020). Amazonian Scrub-Flycatcher (Sublegatus obscurior), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.amsfly1.01
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