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Line-fronted Canastero Asthenes urubambensis Scientific name definitions

J. V. Remsen, Jr.
Version: 1.0 — Published March 4, 2020
Text last updated January 1, 2003

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Introduction

A large and heavily stripped canastero, the Line-fronted Canastero is found in the Andes of Peru and western Bolivia. The Line-fronted Canastero has rich brown upperparts with a conspicuous white supercilium, a pale breast, buffy belly, and rufous orange chin patch. As the name suggests, the Line-fronted Canastero has dark brown streaking across the face and breast. More arboreal than other species of canastero, the Line-fronted Canastero is found in Páramo grassland dotted with mossy scrub and bushes. These birds forage alone or in pairs, feeding on insects in low foliage or on mossy ground, occasionally making short-sally strikes to the underside of grass stems. Although not considered globally threatened, their population is thought to be declining in parts of the range due to habitat degradation caused by grazing, burning and firewood collecting.

Field Identification

17–18 cm; 16–20 g. A large and heavily striped canastero, with narrow and “spiny” tail reminiscent of that of Schizoeaca. Nominate race has conspicuous whitish supercilium broadening behind eye, extending anteriorly to forehead; rest of face light brownish with conspicuous, narrow dark brown streaks; forehead dark brown with sharply defined golden-brown stripes, these fading on paler, browner crown; hindneck and upperparts rich brown, collar of blurry light brown streaks, some of these fading into upper back, some broad pale shaft streaks on uppertail-coverts; wings rich brown, dark fuscous tips of remiges; tail graduated, rectrices narrow and extremely pointed, vanes narrowing from about half-way along to become nearly non-existent at tips, rich brown; chin pale tawny to dark rufous, upper throat tawny to orange-rufous (source of variation uncertain); lower throat light buff-brown with dark brown streaks, blending to paler breast with broad dark brown and pale buff streaks, these fading into pale dull buff belly that contrasts sharply with rich brown flanks and undertail-coverts with pale shaft streaks; iris brown; upper mandible black to grey-horn, lower mandible silver-grey to pinkish, often with darker tip; tarsus and toes olive to grey. Sexes alike. Juvenile undescribed. Race huallagae is slightly darker and redder above, dorsal streaking much more restricted, primarily on forehead and hindneck, with more conspicuous, extensive and whiter (less buffy) streaking below extending through flanks and belly.

Systematics History

Editor's Note: This article requires further editing work to merge existing content into the appropriate Subspecies sections. Please bear with us while this update takes place.

Plumage similarities suggest closer relationship to A. flammulata and A. virgata or to A. maculicauda than to others in genus. Two subspecies recognized.

Subspecies


SUBSPECIES

Asthenes urubambensis huallagae Scientific name definitions

Distribution

Andes of C Peru (San Martín S to Pasco).

SUBSPECIES

Asthenes urubambensis urubambensis Scientific name definitions

Distribution

Andes of S Peru (Cuzco, Puno) and W Bolivia (La Paz, Cochabamba).

Distribution

Editor's Note: Additional distribution information for this taxon can be found in the 'Subspecies' article above. In the future we will develop a range-wide distribution article.

Habitat

Páramo grassland and timber-line ecotone with mossy scrub with Gynoxis and Ribes bushes, and Polylepis groves; 3050–4300 m.

Movement

Resident.

Diet and Foraging

Arthropods. Forages singly or in pairs. More arboreal than congeners, hops along branches; also walks on ground in manner of a pipit (Anthus). Gleans items from moss, bark and foliage in low vegetation, and sometimes from mossy ground; has been seen to make short sally-strikes to underside of grass.

Sounds and Vocal Behavior

Song an ascending trill; call a high “tseut”.

Breeding

No information.
Not globally threatened. Currently considered Near-threatened. Restricted-range species: present in High Andes of Bolivia and Argentina EBA and Peruvian High Andes EBA. Rare to uncommon, locally fairly common; distribution patchy, and clearly limited in areal extent because of narrow elevational range. Populations almost certainly declining, especially in Bolivia, as a result of habitat degradation and loss caused by grazing, burning, and firewood-gathering in timber-line region; Polylepis regeneration also greatly hindered by these activities. Important population of this species recently discovered in Carrasco National Park, in Bolivia, which is evidently fairly well protected. Occurs also in Machu Picchu Historical Sanctuary, in Peru.
Distribution of the Line-fronted Canastero - Range Map
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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Line-fronted Canastero

Recommended Citation

Remsen, Jr., J. V. (2020). Line-fronted Canastero (Asthenes urubambensis), 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.lifcan1.01
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