Narrow-billed woodcreeper

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Narrow-billed woodcreeper
Lepidocolaptes angustirostris -Argentina-8.jpg
L. a. angustirostris in Entre Ríos Province, Argentina
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Furnariidae
Genus: Lepidocolaptes
Species:
L. angustirostris
Binomial name
Lepidocolaptes angustirostris
(Vieillot, 1818)
Lepidocolaptes angustirostris map.svg

The narrow-billed woodcreeper (Lepidocolaptes angustirostris) is a species of bird in the subfamily Dendrocolaptinae of the ovenbird family Furnariidae. It is found in Argentina, Bolivia, Brazil, Paraguay, Suriname, and Uruguay. [2]

Contents

Taxonomy and systematics

The narrow-billed woodcreeper has these eight subspecies: [2]

Several other subspecies have also been proposed as splits from the existing ones. All of the subspecies that adjoin each other intergrade, to the point where some authors have advocated treating the species as monotypic. [3]

Description

The narrow-billed woodcreeper is 18 to 22 cm (7.1 to 8.7 in) long; males weigh 23 to 37.5 g (0.81 to 1.3 oz) and females 21.5 to 33.5 g (0.76 to 1.2 oz). It is a slim, medium-sized woodcreeper with a long, slim, moderately decurved bill. The sexes have the same plumage. Adults of the nominate subspecies L. a. angustirostris have pale lores, a buffy white supercilium that widens to the rear and becomes a line of broken spots, and a black stripe behind the eye. Their crown and nape are blackish brown with whitish buff streaks. Their back and wing coverts are rufous brown with a faint olive tinge; some coverts have dusky outer webs and others olive. Their wings, rump, and tail are rufous-chestnut with browner outer webs and blackish tips on the primaries. Their throat and cheeks are plain whitish. Their breast and belly are buffy-white with dusky spots or streaks; the markings disappear on the lower belly and reappear on the undertail coverts. Their underwing coverts are rosy-cinnamon. Their iris is brown to chestnut, their bill pale gray to pinkish horn with dusky sides on the base of the mandible, and their legs and feet greenish gray to dark gray. Juveniles have darker upperparts than adults, with a more blackish head, more ochraceous supercilium and underparts, and more distinct streaks on the latter. [3]

The subspecies of the narrow-billed woodcreeper differ mostly in the tone of their upper- and underparts and in how much streaking they have. They differ from the nominate and each other thus: [3]

Distribution and habitat

The subspecies of the narrow-billed woodcreeper are found thus. The boundaries between some subspecies are ill defined, especially that between L. a. angustirostris and L. a. praedatus. [2] [3]

The narrow-billed woodcreeper inhabits a variety of semi-open and open landscapes, mostly in the tropical zone but reaching the subtropics in the eastern Andean foothills. These include deciduous forest, Gran Chaco woodlands and scrublands, gallery forest, secondary forest, caatinga , cerrado , plantations, and open parts of populated areas. It is found less frequently in palm swamps. In most of its range it occurs from the lowlands to 1,200 m (3,900 ft); it reaches 3,000 m (9,800 ft) in Bolivia. [3] [4]

Behavior

Movement

The narrow-billed woodcreeper is a year-round resident throughout its range. [3]

Feeding

The narrow-billed woodcreeper's diet is mostly invertebrates like insects and spiders but it has been observed taking a small frog. It typically forages singly or in pairs though sometimes in small groups, and regularly joins mixed-species feeding flocks. It very rarely follows army ant swarms. It hitches up trunks and branches, often in a spiral, typically from near the ground to the subcanopy. It captures prey by gleaning from the surface and by probing bark crevices, epiphytes, and moss. It sometimes flakes off bark to expose prey, and has been observed catching moths around street lights. [3] [5]

Breeding

The narrow-billed woodcreeper's breeding seasons vary somewhat across its range but generally fall between September and February. It nests in cavities, either natural or excavated by woodpeckers in trees but also in human constructs such as bridge supports. The cavities usually are less than 4 m (13 ft) above the ground and are lined with leaves, grasses, or bark and wood chips. The clutch size is usually three or four eggs (sometimes two); both parents incubate them. The incubation period, time to fledging, and other details of parental care are not known. [3] [5]

Vocalization

The narrow-billed woodcreeper's song is "a loud series 3–5 seconds long of 4–8 sharp descending notes that may be either clear whistles 'peer, peer, peer, peeer, peeeer, pweeeer', rolling and somewhat slurred repetitions of 'drewEEew', or clear notes that gradually accelerate, fade and descend, 'peeé, pee-pee-pee-pee-peepeepeepeepupupu'." Its calls include "a slurred note", "jew-rewt", and "peah huy". [3]

Status

The IUCN has assessed the narrow-billed woodcreeper as being of Least Concern. It has a very large range, and though its population size is not known it is believed to be increasing. No immediate threats have been identified. [1] It is considered fairly common to locally common in most of its range but uncommon in parts of it. It seems to be "only moderately sensitive to human disturbance [and] not to be adversely affected by forest fragmentation in S Brazil." [3]

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References

  1. 1 2 BirdLife International (2017). "Narrow-billed Woodcreeper Lepidocolaptes angustirostris". IUCN Red List of Threatened Species . 2017: e.T22703155A110909882. doi: 10.2305/IUCN.UK.2017-1.RLTS.T22703155A110909882.en . Retrieved 10 July 2023.
  2. 1 2 3 Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (January 2023). "Ovenbirds, woodcreepers". IOC World Bird List. v 13.1. Retrieved 27 April 2023.
  3. 1 2 3 4 5 6 7 8 9 10 Marantz, C. A., A. Aleixo, L. R. Bevier, and M. A. Patten (2020). Narrow-billed Woodcreeper (Lepidocolaptes angustirostris), 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.nabwoo1.01 retrieved July 10, 2023
  4. van Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. p. 206. ISBN   978-0-19-530155-7.
  5. 1 2 Monteiro Pereira, José Felipe (2008). Aves e Pássaros comuns do Rio de Janeiro (in Portuguese). Rio de Janeiro: Technical Books. p. 92. ISBN   978-85-61368-00-5.