Vireo

The vireos /ˈvɪrioʊz/ make up a family, Vireonidae, of small to medium-sized passerine birds found in the New World (Canada to Argentina, including Bermuda and the West Indies) and Southeast Asia. "Vireo" is a Latin word referring to a green migratory bird, perhaps the female golden oriole, possibly the European greenfinch.[1][2]

This article is about the bird family. For the bird genus, see Vireo (genus). For other uses, see Vireo (disambiguation).

Vireos
Yellow-throated vireo (Vireo flavifrons)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Passeriformes
Superfamily: Orioloidea
Family: Vireonidae
Swainson, 1837
Genera

They are typically dull-plumaged and greenish in color, the smaller species resembling wood warblers apart from their heavier bills. They range in size from the Chocó vireo, dwarf vireo and lesser greenlet, all at around 10 cm and 8g, to the peppershrikes and shrike-vireos at up to 17 cm and 40g.[3]

Distribution and habitat

Most species are found in Middle America and northern South America. Thirteen species of true vireos occur farther north, in the United States, Bermuda[4] and Canada; of these all but Hutton's vireo are migratory. Members of the family seldom fly long distances except in migration.[5] They inhabit forest environments, with different species preferring forest canopies, undergrowth, or mangrove swamps.[3]

A few species in the genus Vireo have appeared on the eastern side of the Atlantic as vagrants to the Western Palearctic.[6]

Behaviour

The resident species occur in pairs or family groups that maintain territories all year (except Hutton's vireo, which joins mixed feeding flocks). Most of the migrants defend winter territories against conspecifics. The exceptions are the complex comprising the red-eyed vireo, the yellow-green vireo, the black-whiskered vireo, and the Yucatan vireo, which winter in small wandering flocks.[5]

Voice
The song of the rufous-browed peppershrike is described as a whistled phrase with the rhythm Do you wash every week?ⓘ

Males of most species are persistent singers. Songs are usually rather simple, monotonous in some species of the Caribbean littoral and islands, and most elaborate and pleasant to human ears in the Chocó vireo and the peppershrikes.[5]

Breeding

The nests of many tropical species are unknown. Of those that are known, all build a cup-shaped nest that hangs from branches. The female does most of the incubation, spelled by the male except in the red-eyed vireo complex.[5]

Feeding

All members of the family eat some fruit but mostly insects and other arthropods. They take prey from leaves and branches; true vireos also flycatch, and the gray vireo takes 5 percent of its prey from the ground.[5]

Systematics
A white-eyed vireo (Vireo griseus bermudianus) in Bermuda

The six genera of these birds make up the family Vireonidae, and are believed to be related to the crow-like birds in family Corvidae and the shrikes in family Laniidae. Recent biochemical studies have identified two babbler genera (Pteruthius and Erpornis) which may be Old World members of this family.[7] Observers have commented on the vireo-like behaviour of the Pteruthius shrike-babblers, but apparently no-one suspected the biogeographically unlikely possibility of vireo relatives in Asia.

The family can be conveniently though perhaps inaccurately categorised by genus as the true vireos, the greenlets, the shrike-vireos and the peppershrikes. Preliminary genetic studies by Johnson et al. revealed large interspecific genetic distances between clades within Vireo and Hylophilus of a similar magnitude to differences between Cyclarhis and Vireolanius. Furthermore, some vireo and greenlet species may be closer to the peppershrikes than to their respective congeners. A more comprehensive study may reveal this family to be considerably undersplit at both the generic and species level.

Species in taxonomic order
ImageGenusSpecies
Pteruthius - shrike-babblers[7] Swainson, 1832
Erpornis [8] Hodgson, 1844
Cyclarhis Swainson, 1824, the peppershrikes
Vireolanius Bonaparte, 1850, the shrike-vireos
Hylophilus Temminck, 1822
Tunchiornis Slager & Klicka, 2014
Pachysylvia Bonaparte, 1850
Vireo Vieillot, 1808, the true vireos.

References
  1. Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 402. ISBN 978-1-4081-2501-4.
  2. "Vireo". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. Forshaw, Joseph & Parkes, Kenneth C. 1991. Encyclopaedia of Animals: Birds, p. 209. Merehurst Press, London. ISBN 1-85391-186-0
  4. White-eyed vireo, Audubon Society of Bermuda
  5. Salaman, Paul & Barlow, Jon C. 2003. Vireos. Pp. 478–479 in; Perrins, C. ed. The Firefly Encyclopedia of Birds. Firefly Books, Oxford. ISBN 1-55297-777-3
  6. "Western Palearctic". Avibase. Retrieved 27 February 2017.
  7. Reddy, Sushma & Cracraft, Joel (2007): Old World Shrike-babblers (Pteruthius) belong with New World Vireos (Vireonidae). Molecular Phylogenetics and Evolution, 44 (3): 1352–1357. doi:10.1016/j.ympev.2007.02.023
  8. Barker, F. Keith; Cibois, Alice; Schikler, Peter A.; Feinstein, Julie & Cracraft, Joel (2004): "Phylogeny and diversification of the largest avian radiation." PNAS 101(30): 11040-11045. doi:10.1073/pnas.0401892101 PMID 15263073 Supporting information
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