Cassin's vireo (Vireo cassinii) is a small North American songbird, ranging from southern British Columbia in Canada through the western coastal states of the United States. This bird migrates, spending the winter from southern Arizona (the Sonoran Desert) to southern Mexico.
The vireo is 11–14 cm (4–6 inches) in length, with a gray head, back, and flanks, and whitish underparts. It has solid white "spectacles" and white wing bars.
The song, given persistently, consists of short, rough whistled phrases of several notes, spaced about 2 seconds apart. The phrases often alternate ending on a high note and a low note, giving an impression of question and answer.
It prefers open woodlands of the western mountains and foothills. It is usually found in the middle to lower portions of the forest canopy, where it slowly and deliberately forages for insects among the foliage.
Cassin's vireo builds a cup nest out of bark strips and down in the fork of a twig. It lays 2 to 5 white eggs with some brown spots.
This species was formerly considered to belong to the same species as the plumbeous vireo and blue-headed vireo. At that time, this complex of species was referred to as the "solitary vireo".
This vireo is named after the ornithologist John Cassin.
References
- ^ BirdLife International (2016). "Vireo cassinii". IUCN Red List of Threatened Species. 2016: e.T22705228A94006862. doi:10.2305/IUCN.UK.2016-3.RLTS.T22705228A94006862.en. Retrieved 25 September 2021.
External links
- Cassin's Vireo species account Cornell Lab of Ornithology
- Cassin's Vireo at USGS
- Article & RangeMaps InfoNatura NatureServe
- Cassin's Vireo photo gallery VIREO
- Cassin's Vireo videos Archived 2007-10-21 at the Wayback Machine on the Internet Bird Collection
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- DescriptionVireo cassinii - Cassin's Vireo XC579451.mp3 English: :Amplified the sound. The habitat was where redwood trees and sun-dappled bushes. There...(MP3 audio file, 20 s) - 07:35, 23 July 2022
- DescriptionVireo cassinii - Cassin's Vireo XC269951.mp3 English: :Recording unmodified but a trimmed portion of the longer original file. Extracted from...(MP3 audio file, 1 min 8 s) - 12:51, 24 February 2022
- DescriptionCassin's Vireo (Vireo cassinii)1.jpg English: Sierra de la Laguna, Baja California Date 12 March 2010, 08:36:52 Source https://www.flickr...(960 × 640 (519 KB)) - 21:57, 7 February 2024
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