Worm-eating warbler | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Passeriformes |
Family: | Parulidae |
Genus: | Helmitheros Rafinesque, 1819 |
Species: | H. vermivorum |
Binomial name | |
Helmitheros vermivorum (Gmelin, JF, 1789) | |
Range Breeding range Winter range | |
Synonyms [2] | |
Helmitheros vermivorus |
The worm-eating warbler (Helmitheros vermivorum) is a small New World warbler that breeds in the Eastern United States and migrates to southern Mexico, the Caribbean, and Central America for the winter.
The worm-eating warbler was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae . He placed it with the wagtails in the genus Motacilla and coined the binomial name Motacilla vermivora. [3] Gmelin based his account on the "worm-eater" that had been described and illustrated in 1760 by the English naturalist George Edwards in his Gleanings of Natural History. Edwards had received a specimen from the American naturalist William Bartram that had been collected in Pennsylvania. [4] The worm-eating warbler is now placed in the genus Helmitheros that was introduced in 1819 by the French polymath Constantine Samuel Rafinesque. [5] [6] The genus name combines the Ancient Greek helmins meaning "worm", and -thēras meaning "hunter". The specific epithet vermivorum is from Latin vermis meaning "worm" and -vorus meaning "-eating". [7] The species is monotypic: no subspecies are recognised. [6]
The worm-eating warbler is a small New World warbler. It is around 13 cm (5.1 in) in length and weighs 11.8–17.4 g (0.42–0.61 oz). [8] It is relatively plain with olive-brown upperparts and light-coloured underparts, but has black and light brown stripes on its head. It has a slim pointed bill and pink legs. In immature birds, the head stripes are brownish. The male's song is a short high-pitched trill. This bird's call is a chip or tseet. Worm-eating warblers are sexually monomorphic. [9] Males and females can only reliably be sexed during the breeding season by the presence of a brood patch in females or a cloacal protuberance in males. These birds are also difficult to age. Hatch year/second year birds have rusty tips on tertials that wear off by March of the following year. Juveniles can be distinguished by duskier head markings, and cinnamon wingbars.
These birds breed in the Eastern United States. Their selected habitats vary significantly between populations. [10] In much of their range, worm-eating warblers are associated with mature hardwood forests on steep slopes. However, recent attention has been focused on coastal breeding populations, as little is known about their ecology or status. Historically, coastal populations would select for pocosin ecosystems. More recently, however, these populations have shifted to frequent use of pine plantations. Current use of pine plantations has resulted in densities higher than in areas previously thought to be their natural habitat. This shift in habitat selection likely demonstrates that worm-eating warblers are more closely associated with shrub structure than stand age or size. If this is the case, the landscape changes that occurred on the Atlantic coastal plain may have had less of an impact on these birds than previously described. Maintaining this species habitat may require managing for dense shrubby midstory and understory. Due to their reliance on shrub structure for foraging, and ground nesting behavior, frequent fires have a negative impact on this species. [11] Other management strategies that reduce the shrub mid-story, increase herbaceous growth, and decrease canopy cover are likely to have a similar effect. More information is needed about their breeding habits in coastal regions as these forests are likely to represent different conditions from their inland counterparts. [12] Fat deposits play a key role in allowing for long distance migration in most passerines. Stopover habitat, or areas that allow birds to replenish their fat stores, are also critical. [13]
In winter, these birds migrate to southern Mexico, the Greater Antilles, and Central America particularly along the Caribbean Slope where they occupy both scrub and moist forests. [14] Worm-eating warblers have disappeared from some parts of their range due to habitat loss but their ability to use both scrub and moist forest ecosystems may be beneficial to the long term conservation of this species. [15]
This bird breeds in dense deciduous forests in the eastern United States, usually on wooded slopes. The nest is an open cup placed on the ground, hidden among dead leaves. It is one of several species of new-world warblers that nests on the ground including the black-and-white warbler (Mniotilta varia), the ovenbird (Seiurus aurocapilla), the northern waterthrush (Parkesia noveboracensis), Louisiana waterthrush (Parkesia motacilla), palm warbler (Setophaga palmarum), and the Kentucky warbler (Geothlypis formosa). The female lays four or five eggs. Both parents feed the young; they may try to distract predators near the nest by pretending to be injured. Worm-eating warblers are often parasitized by brown-headed cowbirds (Molothrus ater) where forest fragmentation occurs. [16] Reducing forest fragmentation may prove vital if populations of worm-eating warblers suffer large declines.
The diet of worm-eating warblers varies across habitat types. [17] This variation can be attributed to different predator avoidance strategies employed by common prey items. On their breeding grounds, worm-eating warblers glean mostly from live foliage, searching for arthropods. On the wintering grounds, this species gleans insects almost exclusively from dead plant material. The name "worm-eating" refers to the numerous Lepidopteran larvae that this species consumes; they rarely if ever eat earthworms.
Use of pesticides, especially those broadcast over a wide area, is likely to have an effect on most insectivorous songbird species, including the worm-eating warbler. [18] These pesticides decrease the species' primary food source and could result in long-term toxicity.
The willow warbler is a very common and widespread leaf warbler which breeds throughout northern and temperate Europe and the Palearctic, from Ireland east to the Anadyr River basin in eastern Siberia. It is strongly migratory, with almost all of the population wintering in sub-Saharan Africa.
The willet is a large shorebird in the family Scolopacidae. It is a relatively large and robust sandpiper and is the largest of the species called "shanks" in the genus Tringa. Its closest relative is the lesser yellowlegs, a much smaller bird with a very different appearance apart from the fine, clear, and dense pattern of the neck, which both species show in breeding plumage. It breeds in North America and the West Indies and winters in southern North America, Central America, the West Indies and South America.
The greater yellowlegs is a large shorebird in the family Scolopacidae. It breeds in central Canada and southern Alaska and winters in southern North America, Central America, the West Indies and South America.
The lesser yellowlegs is a medium-sized shorebird. It breeds in the boreal forest region of North America.
The short-billed dowitcher, like its congener the long-billed dowitcher, is a medium-sized, stocky, long-billed shorebird in the family Scolopacidae.
The Sardinian warbler is a common and widespread typical warbler from the Mediterranean region. Like most Curruca species, it has distinct male and female plumages. The adult male has a grey back, whitish underparts, black head, white throat and red eyes. Plumages are somewhat variable even in the same locality, with the intensity of a reddish hue on upper- and/or underside that varies from absent to pronounced. The female is mainly brown above and buff below, with a grey head. The Sardinian warbler's song is fast and rattling, and is very characteristic of the Mediterranean areas where this bird breeds.
The marsh warbler is an Old World warbler currently classified in the family Acrocephalidae. It breeds in temperate Europe and the western Palearctic and winters mainly in southeast Africa. It is notable for incorporating striking imitations of a wide variety of other birds into its song.
The red-breasted sapsucker is a medium-sized woodpecker of the forests of the west coast of North America.
The purple finch is a bird in the finch family, Fringillidae. It breeds in the northern United States, southern Canada, and the west coast of North America.
The northern waterthrush is a species of ground-feeding migratory New World warbler of the genus Parkesia. It breeds in the northern part of North America in Canada and the northern United States including Alaska, and winters in Central America, the West Indies and Florida, as well as in Venezuela, Colombia, and Ecuador. It is a rare vagrant to other South American countries and to western Europe. Its closest relative is the Louisiana waterthrush.
The Louisiana waterthrush is a New World warbler, that breeds in eastern North America and winters in the West Indies and Central America. Plain brown above, it is white below, with black streaks and with buff flanks and undertail, distinguishing it from the closely related northern waterthrush. The habitats it prefers are streams and their surroundings, and other wet areas.
The Canada warbler is a small boreal songbird of the New World warbler family (Parulidae). It summers in Canada and northeastern United States and winters in northern South America.
The cinnamon bittern or chestnut bittern is a small Old World bittern, breeding in tropical and subtropical Asia from India east to China and Indonesia. It is mainly resident, but some northern birds migrate short distances. This species was formerly placed in the genus Ixobrychus.
The tawny-flanked prinia is a small passerine bird belonging to the genus Prinia in the family Cisticolidae, a family of Old World warblers. It is widespread and common in most parts of Africa south of the Sahara. The plain prinia of southern Asia was formerly included in this species but is now usually considered to be a separate species.
The forest wagtail is a medium-sized passerine bird in the wagtail family Motacillidae. It has a distinctive plumage that sets it apart from other wagtails and has the habit of wagging its tail sideways unlike the usual up and down movements of the other wagtail species. It is the only wagtail species that nests in trees. It is found mainly in forested habitats, breeding in the temperate parts of east Asia and wintering across tropical Asia from India to Indonesia.
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The white-throated oxylabes is a species of passerine bird that is endemic to Madagascar. It is the only species placed in the genus Oxylabes. Formerly considered as a member of the Old World warbler family Sylviidae, it has been moved to the family Bernieridae — the Malagasy warblers. Its natural habitat is subtropical or tropical moist lowland forests.
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The eastern yellow wagtail is a small passerine in the wagtail family Motacillidae, which also includes the pipits and longclaws. It was often classified as a subspecies of the Western yellow wagtail. It breeds in the eastern Palearctic and Alaska and migrates to South Asia and Australia.
The Pennsylvania State Game Lands Number 147 are Pennsylvania State Game Lands in Blair County in Pennsylvania in the United States providing hunting, trapping, bird watching, and other activities.