Cassin's Vireo

Cassin's Vireo (Vireo cassinii) is in the Vireos, Shrike-Babblers, and Erpornis family (Vireonidae). Across the U.S., iNaturalist users have logged 2,144 research-grade observations of it in our sample, peaking in April.

Seasonal pattern in the national data: spring and fall migrant. Counts also reflect when people are out photographing, so compare months within a state rather than across states.

When to photograph Cassin's Vireo: observations by month (U.S.)

About Cassin's Vireo

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.From Wikipedia via iNaturalist — article, CC BY-SA.

Cassin's Vireo by state

Main season = months with at least 30% of the state's peak-month count.

Related birds (Vireos, Shrike-Babblers, and Erpornis)

Red-eyed VireoVireo olivaceus

White-eyed VireoVireo griseus

Blue-headed VireoVireo solitarius

Eastern Warbling VireoVireo gilvus

Western Warbling VireoVireo swainsoni

Hutton's VireoVireo huttoni

Yellow-throated VireoVireo flavifrons

Bell's VireoVireo bellii

Photography tips

• Use a fast shutter (1/2000 s or faster) for birds in flight.
• Focus on the eye and shoot at the bird's eye level.
• Approach slowly and stop if the bird changes behavior; never bait or flush birds.
• Morning activity peaks in the first two hours after sunrise.

FAQ