| 词条 | Gray vireo |
| 释义 |
| name = Gray vireo | status = LC | status_system = IUCN3.1 | status_ref = [1] | image = Vireo vicinior1.jpg | genus = Vireo | species = vicinior | authority = Coues, 1866 }} The gray vireo (Vireo vicinior) is a small North American passerine bird. It breeds from the southwestern United States and northern Baja California to western Texas. It is a migrant, wintering in northwestern Mexico, in western Sonora state, and the southern Baja Peninsula in Baja California Sur; it remains all year only in Big Bend National Park in southwest Texas. It is usually found at altitudes between {{convert|400|and|2500|m}} in its Mexican breeding grounds. This vireo frequents dry brush, especially juniper, on the slopes of the southwestern mountains.[2] DescriptionThe gray vireo is {{convert|14|cm|in|frac=4|abbr=on}} in length, gray above, and dull white below, with a single faint wing bar and an eye-ring. It has a short, thick bill. Sexes are similar. The sideways twitching of its tail is unique among vireos and is reminiscent of that of gnatcatchers. The song is hu-wee, chu-wee, che-weet, chee, ch-churr-weet, churr, schray. BehaviorThe gray vireo has skulking habits and is difficult to observe in the dense vegetation it inhabits which is mostly pinyon-juniper woodland or scrub oak woodland. It feeds mainly on insects, and birds that overwinter in Mexico additionally consume fruit. Nests are built within {{convert|2|m}} of the ground, often in a thorny tree and consist of dry grasses, plant remains, shreds of bark and spider's web, lined with grasses and fine fibres. A clutch of three or four white eggs is laid and incubated by both parents for about thirteen days. The young leave the nest a fortnight later. Attempted parasitism by the brown-headed cowbird (Molothrus ater) often causes the nest to be abandoned.[2] References1. ^{{IUCN|id=22705209 |title=Vireo vicinior |assessor=BirdLife International |assessor-link=BirdLife International |version=2013.2 |year=2012 |accessdate=26 November 2013}} 2. ^1 {{cite web|url=http://txtbba.tamu.edu/species-accounts/gray-vireo/ |title=Gray vireo |author=Tweit, Robert C. |year=2005 |work=The Texas Breeding Bird Atlas |accessdate=2014-09-21}} External links
8 : Vireo (genus)|Endemic birds of Southwestern North America|Native birds of the Southwestern United States|Birds of Mexico|Fauna of the Sonoran Desert|Fauna of the Chihuahuan Desert|Birds of the U.S. Rio Grande Valleys|Birds described in 1866 |
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