About the Cassin's Vireo
Cassin's vireo is a small North American songbird, ranging from southern British Columbia in Canada through the western coastal states of the United States, including California, Oregon, and Washington. The Cassin's Vireo moves down Western United States forests in its migration. During its migration in early spring and late fall, it spends the winter in regions from southern Arizona to southern Mexico, including parts of Baja California and the Pacific coast of Mexico.
Text adapted from Wikipedia, licensed CC BY-SA 4.0.
ID tip
The vireo is 11–14 cm (4–6 inches) long. It has a grayish olive head, back, and flanks, with whitish underparts. One of its distinctive features is the solid white "spectacles" around its eyes, along with white wing bars. These markings set it apart from other similar species like the plumbeous vireo and the blue-headed vireo.
Text from Wikipedia, licensed CC BY-SA 4.0.
What the Cassin's Vireo sounds like
Where the Cassin's Vireo lives
When to see the Cassin's Vireo
Peak activity in May · a summer visitor species across most of its range
Easily confused with
Plumbeous VireoVireo plumbeusThe plumbeous vireo is 12.4 to 13.8 cm (4.9 to 5.4 in) long and weighs about 12 to 20 g (0.42 to 0.71 oz).
Philadelphia VireoVireo philadelphicusAdults are mainly olive-brown on the upperparts with yellow underparts; they have dark eyes and a grey crown.
Bell's VireoVireo belliiMeasurements:
Length: 4.5–4.9 in (11.5–12.5 cm)
Weight: 0.3–0.3 oz (7.4–9.8 g)
Wingspan: 6.7–7.5 in (17–19 cm)
Side by side: Cassin's Vireo vs Hutton's Vireo · Bell's Vireo vs Cassin's Vireo · Cassin's Vireo vs Philadelphia Vireo · Cassin's Vireo vs Plumbeous Vireo
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