Woodcreepers | |
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Cocoa woodcreeper | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Passeriformes |
Family: | Furnariidae |
Subfamily: | Dendrocolaptinae |
Genera | |
16, see article text |
The woodcreepers (Dendrocolaptinae) comprise a subfamily of suboscine passerine birds endemic to the Neotropics. They have traditionally been considered a distinct family Dendrocolaptidae, but most authorities now place them as a subfamily of the ovenbirds (Furnariidae). They superficially resemble the Old World treecreepers, but they are unrelated and the similarities are due to convergent evolution. The subfamily contains 60 species in 16 genera. [1]
Woodcreepers range from 14 to 35 cm in length. [2] [3] Generally brownish birds, the true woodcreepers maintain an upright vertical posture, supported by their specialized stiff tails. [4]
They feed mainly on insects taken from tree trunks. Some woodcreepers often form part of the core group at the centre of flocks attending army ant swarms. Woodcreepers are arboreal cavity-nesting birds; two or three white eggs are laid and incubated for about 15 to 21 days. [2]
These birds can be difficult to identify in that they tend to have similar brown upperparts, and the more distinctive underparts are hard to see on a bird pressed against a trunk in deep forest shade. The bill shape, extend/shape of spots/streaks, and call are useful aids to determining species.
The woodcreepers are generally fairly uniform in appearance. They range in size from the wedge-billed woodcreeper (13 cm (5.1 in)) to the strong-billed woodcreeper (35 cm (14 in)). Males tend to be slightly larger than females on average, but considerable overlap in size occurs in most species. Pronounced sexual dimorphism in size and plumage is rare. Bill size and shape accounts for much of the variation between the species. Bills can be straight or highly decurved, and can account for as much as a quarter of the length of the bird (as happens in the long-billed woodcreeper). The plumage is usually subdued and often brown, or sometimes rufous or other dark colours. Many species have patterns such as checking, spotting, or barring on their plumage. The feathers of the tail are rigid and are used for supporting the body when climbing tree trunks; [5] [4] the tail can support most of the body weight and birds that lose their tail find climbing difficult. Woodcreepers climb by flexing their legs and hopping up the trunk. The feet of the woodcreepers are also modified for climbing. The front toes are strongly clawed and toe IV is as long as toe III to increase the ability of the bird to grasp around branches. [4] The legs are short but strong. [3] Woodcreepers are also characterized by a belly feather growth pattern not found in any other birds.
The woodcreepers are generally forest birds of Central and South America. Most species occur in rainforests, with the centre of diversity of the subfamily being the Amazon Basin. As many as 19 species of woodcreeper may co-occur in some areas of the Amazon, although in other rainforests, such as those in Costa Rica, the numbers are much lower. Other habitats used by the woodcreepers include pine-oak woodland, montane cloud forest, and pine forests. A few species, like the scimitar-billed woodcreeper, inhabit savannah or other partly open environments. Woodcreepers are absent from the temperate forests of southern South America. [3]
The woodcreepers are insectivores that are mostly arboreal in nature. Insects form the majority of the diet, with some spiders, centipedes, millipedes and even lizards being taken as well. A few specimens collected by scientists had fruit or seeds in their stomachs, but plant material is not thought to be regularly taken by any species. A few species forage on the ground, but most forage on the trunks of trees, on and on the underside of branches. They are generally solitary or occur in pairs, but frequently join mixed-species feeding flocks. The flocks they join are usually the lower level ones rather than canopy flocks, and are usually those insectivorous ones rather than frugivorous ones. Prey is almost always obtained by moving up the trunk or branch, and there are two main foraging techniques, probing and sallying. Probers investigate rough bark, mosses, masses of trapped dead leaves, bromeliads, and other areas where prey may be hiding, whereas those that sally launch into the air briefly to snatch prey that has been flushed by their movement. Several species regularly attend swarms of army ants to catch prey flushed by the ants. [6]
The former family has been merged into the ovenbird family, Furnariidae, by most authorities because analyses of mt and nDNA sequence data showed Sclerurus leaftossers and Geositta miners to be basal to the Furnariidae and the woodcreepers. [7] An alternative option was recommended by Moyle et al. (2009), [8] in which the woodcreepers maintain their status as a family, while the ovenbirds (as traditionally defined) are split into two families: Scleruridae and Furnariidae.
The genus Xenops , which have usually been considered ovenbirds, represent an early divergence. Although some analyses suggested that they are more closely related to the woodcreepers than to true furnariids, [9] other studies have not found the same results. [8] [10] Others suggested placing Xenops in its own family Xenopidae. [11]
Evolutionary relationships among woodcreeper species are now fairly well known thanks to the use of DNA sequence data. [12] [8] [10] Some previous results based on morphology [13] were not supported by molecular data, mostly due to instances of convergent evolution in beak morphology. [12] Plumage patterns, on the other hand, are more in agreement with the molecular data.
DNA studies revealed that Deconychura species belong into separate genera [14] and that the Greater scythebill is not closely related to other scythebills in the genus Campylorhamphus but to Drymornis. [15] Moving Lepidocolaptes fuscus to Xiphorhynchus restores monophyly of Lepidocolaptes .
Additionally, the species-level taxonomy of several groups requires further study. Examples of "species" where vocal and morphological variations suggests that more than one species-level taxon could be involved are the curve-billed scythebill and the white-chinned, olivaceous, strong-billed and straight-billed woodcreepers. The genus Xiphorhynchus also requires much more research in this regard. [16] [17] Hylexetastes may contain anything from one to four species.
A cladogram of the 16 woodcreeper genera based on the results of a 2020 molecular phylogenetic study of the suboscines by Michael Harvey and collaborators is shown below. [18]
Dendrocolaptinae |
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Tribe | Image | Genus | Species |
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Sittasomini – "intermediate" woodcreepers [8] | CerthiasomusDerryberry et al., 2010 |
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DeconychuraCherrie, 1891 |
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SittasomusSwainson, 1827 |
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Dendrocincla G.R. Gray, 1840 |
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Dendrocolaptini – "strong-billed" woodcreepers [8] | |||
GlyphorynchusWied-Neuwied, 1831 |
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NasicaLesson, 1830 |
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DendrexetastesEyton, 1851 |
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Dendrocolaptes Hermann, 1804 |
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Hylexetastes P.L. Sclater, 1889 |
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Xiphocolaptes Lesson, 1840 |
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Dendroplex Swainson, 1827 |
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Xiphorhynchus Swainson, 1827 (possibly polyphyletic) |
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Campylorhamphus W. Bertoni, 1901 |
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DrymotoxeresClaramunt, Derryberry, Chesser, RT, Aleixo & Brumfield, 2010 |
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DrymornisEyton, 1852 |
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Lepidocolaptes Reichenbach, 1853 |
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Ovenbirds or furnariids are a large family of small suboscine passerine birds found from Mexico and Central to southern South America. They form the family Furnariidae. This is a large family containing around 321 species and 71 genera. The ovenbird, which breeds in North America, is not a furnariid – rather it is a distantly related bird of the wood warbler family, Parulidae.
The Tyranni (suboscines) are a suborder of passerine birds that includes more than 1,000 species, a large majority of which are South American. It is named after the type genus Tyrannus. These have a different anatomy of the syrinx musculature than the oscines, hence the common name of suboscines.
Xenops is a genus in the bird family Furnariidae, the ovenbirds. The genus comprises four species of xenops, all of which are found in Mexico, Central America and South America, particularly in tropical rain forests.
Synallaxis is a genus of birds in the ovenbird family, Furnariidae. It is one of the most diverse genera in the family and is composed of small birds that inhabit dense undergrowth across tropical and subtropical habitats in the Neotropical region. Some species show contrasting plumage patterns involving rufous crown and wing patches and black throat patches but they are difficult to see as they keep ensconced in vegetation most of the time. Most species show the long graduated tail with pointy feathers that is typical of spinetails. They are also characterized by constructing large domed nests with stick, including a long entrance tube. Some species can be difficult to distinguish from one another on the basis of their plumage, but can be told apart by their vocalizations, which can be quite distinctive.
Automolus is a genus of bird in the ovenbird family Furnariidae.
The greater scythebill is a Near Threatened species of suboscine passerine bird in the subfamily Dendrocolaptinae of the ovenbird family Furnariidae. It is found in Colombia, Ecuador, and Peru.
The spot-throated woodcreeper is a species of bird in subfamily Dendrocolaptinae of the ovenbird family Furnariidae. It is found in Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Venezuela, and possibly Suriname.
The straight-billed reedhaunter is a South American bird species in the family Furnariidae.
The curve-billed reedhaunter is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Brazil, and Uruguay.
The great spinetail is a Near Threatened species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is endemic to Peru.
Cabanis's spinetail is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Brazil, Bolivia, and Peru.
McConnell's spinetail is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Brazil, French Guiana, Guyana, Suriname, and Venezuela.
The dusky spinetail is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Colombia, Ecuador, and Peru.
Syndactyla is a genus of foliage-gleaners, birds in the ovenbird family Furnariidae. It now includes the two recurvebills.
Tschudi's woodcreeper is a passerine bird native to South America. It belongs to the genus Xiphorhynchus in the woodcreeper subfamily, Dendrocolaptinae. It is usually regarded as a subspecies of the ocellated woodcreeper. It is named after Johann Jakob von Tschudi, the Swiss explorer and naturalist who first described the bird.
Tyrannides is a clade of passerine birds that are endemic to the Americas. The group likely originated in South America during the Eocene, about 45 million years ago.
Pseudasthenes is a genus of small suboscine passerine birds, commonly known as canasteros or false canasteros, in the ovenbird family. It was described in 2010 to accommodate four species split from the related genus Asthenes. The genus is endemic to South America
Joel Lester Cracraft, is an American paleontologist and ornithologist. He received a PhD in 1969 from Columbia University.
Neophilydor is a genus of foliage-gleaners, birds in the ovenbird family Furnariidae. The two species in the genus are found in parts of Middle and South America.