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Grey Vireo

Vireo vicinior

The Gray Vireo, Vireo vicinior, presents itself as a small North American passerine, modest in its plumage with a predominant gray hue above and a dull white below. It measures approximately 14 cm (5+1⁄2 in) in length. Both sexes share a similar appearance, adorned with a single faint wing bar and an eye-ring, and possess a short, thick bill. A distinctive behavior of this species is the sideways twitching of its tail, a motion not shared with other vireos but rather reminiscent of gnatcatchers.

Identification Tips

When attempting to identify the Gray Vireo, look for its gray upperparts, dull white underparts, and the subtle wing bar. The eye-ring is another key feature. Its bill is short and stout, suitable for its diet. The unique tail movement, a sideways twitch, can be a helpful identifier in the field.

Habitat

The Gray Vireo is typically found in dry brush habitats, with a particular affinity for juniper on the slopes of the southwestern mountains.

Distribution

This bird breeds from the southwestern United States through to northern Baja California and westward to Texas. It is migratory, wintering in northwestern Mexico, including western Sonora and the southern Baja Peninsula. Notably, it remains year-round in Big Bend National Park, located in southwest Texas.

Behaviour

The Gray Vireo is known for its skulking habits, making it a challenge to observe within the dense vegetation of its preferred habitats, such as pinyon-juniper woodland or scrub oak woodland.

Song & calls

The vocal repertoire of the Gray Vireo includes a distinctive song that can be transcribed as "hu-wee, chu-wee, che-weet, chee, ch-churr-weet, churr, schray," a series of notes that can aid in its detection and identification.

Breeding

Nests of the Gray Vireo are constructed within 2 meters of the ground, often in a thorny tree. These nests are composed of dry grasses, plant remains, shreds of bark, and spider's web, and are lined with grasses and fine fibers. Both parents share the duty of incubating the clutch of three or four white eggs for about thirteen days. The fledglings then depart the nest approximately two weeks later.

Similar Species

While the Gray Vireo may be confused with other vireos, its unique tail twitching behavior and habitat preferences can help distinguish it from its congeners.

Diet and Feeding

The diet of the Gray Vireo primarily consists of insects. During the winter months in Mexico, the birds supplement their diet with fruit.

Conservation status

The Gray Vireo is currently listed as Least Concern on the IUCN Red List, indicating that, at present, there are no immediate threats to its population numbers that would warrant a higher level of concern.

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Grey Vireos on Birda

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Cadance HA
18 Aug 2024 - 8:16pm
United States
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