Philadelphia Vireo
Vireo philadelphicus
The Philadelphia Vireo is a rare migrant to Britain, typically seen during the autumn months, particularly in the western and southern regions of the country. It is a small, inconspicuous bird that can be easily overlooked, but its presence can be a thrilling sight for British birdwatchers.
Field Identification Guide
Use these features to identify Philadelphia Vireo in the field.
The Philadelphia Vireo can be identified by its yellow-green upperparts, white wing bars, and a distinctive dark line through its eye, as well as its pale yellow breast and white belly. Its head pattern, with a grey cap and white eyebrow stripe, is also a key feature.
The Philadelphia Vireo is slightly smaller than a Great Tit, measuring around 10-12 cm in length.
The male Philadelphia Vireo has a yellow-green back, wings, and tail, with a grey cap on its head, white eyebrow stripe, and a dark eye stripe, while its breast and belly are pale yellow and white, respectively.
The female Philadelphia Vireo is similar to the male, with subtle differences in the intensity of its colours, but overall, its plumage is nearly indistinguishable from that of the male.
The Philadelphia Vireo's call is a sharp, nasal "chip" or "tzit" sound, while its song is a series of short, musical phrases that sound like a slow, whistled tune.
The Philadelphia Vireo is an active, agile bird that forages for insects and spiders in trees and shrubs, often flying between branches with a swift, darting motion, and frequently hovering in mid-air to catch its prey.
The Philadelphia Vireo can be confused with the Warbling Vireo, but can be distinguished by its darker eye stripe, yellow-green upperparts, and white wing bars, as well as its more subdued song and call.
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