Vireo

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
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Suborder: Passeri
Family: Vireonidae
Swainson, 1837
Genera

The vireos /ˈvɪri.oʊz/ make up a family, Vireonidae, of small to medium-sized passerine birds (mostly) restricted to the New World. 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 centimeters and 8 grams, to the peppershrikes and shrike-vireos at up to 17 centimeters and 40 grams (Forshaw & Parkes 1991).

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 and Canada; of these all but Hutton's vireo are migratory. Members of the family seldom fly long distances except in migration (Salaman & Barlow 2003). They inhabit forest environments, with different species preferring forest canopies, undergrowth, or mangrove swamps (Forshaw & Parkes 1991).

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 (Salaman & Barlow 2003).

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 (Salaman & Barlow 2003).

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 (Salaman & Barlow 2003).

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 (Salaman & Barlow 2003).

Systematics

The four 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 (Reddy & Cracraft 2007). 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

Possible candidates for relocation to this family

References

External links

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