Hutton's Vireo closely resembles a Ruby-crowned Kinglet in plumage and behavior but is slightly larger with a heavier bill. It is the only vireo that does not migrate in the western US — a permanent resident of oak woodlands on the Pacific Slope. Its slow, wheezy, repeated 'zweeo' call is the best identification cue.
Best time to see a Hutton's Vireo
The best time to see a Hutton's Vireo is January–July, when about 63% of U.S. sightings happen, based on 6,107 research-grade iNaturalist observations.
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