This vireo had me stumped. Drab gray bird lacks any distinctive features. Similar to a Warbling Vireo but note overall brighter yellow color, with the most intense yellow on the throat - bright Warbling Vireos are palest on the throat. Other features, such as the shape and extent of the supercilium (eyebrow), or the presence/absence of a contrast between a greenish back and a grayish crown (typically, a Philadelphia Vireo trait) show quite a bit of variation. The approximations given in the Sibley and Nat Geo guides, such as the dark wedge to the loral area (Philadelphia) or the lack of this feature (Warbling) are merely averages. Many thanks to Gillian Mastromatteo, Owen Strickland, Tracie Kovener, Norbert Haché, and David Baird for the use of their superb photos. Advanced Birding. The intensity of yellow here is as high or higher than adjacent areas throughout the underparts. 3 ℗ 2014 Neville Recording Released on: 2014-08-25 Auto-generated by YouTube. Few birders would question the identity of the bird at left; however, the identification of the bird at right could be cause for concern esp. Comparing Philadelphia Vireo to Warbling Vireo, the collective impression of its slightly stouter bill, slightly rounder head shape, pot belly, and slightly shorter tail provides the expression of a plump n portly vireo; a “look” I find impossible to find in any examples of Warbling. Both Vireos vary in the amount to yellowish on their flanks. Philadelphia or Warbling Vireo? Philadelphia Vireo: Medium vireo with olive-green upperparts and yellow-washed to yellow underparts. Black-whiskered vireo. Comparing Philadelphia Vireo to Warbling Vireo, the collective impression of its slightly stouter bill, slightly rounder head shape, pot belly, and slightly shorter tail provides the expression of a plump n portly vireo; a “look” I find impossible to find in any examples of Warbling. An example of autumn plumage variation in Philadelphia Vireos. Look for Philadelphia's dark line through the eye all the way to the bill; in Warbling Vireo … Kaufman, K. 1990. As always, the distribution of yellowish tone to the underparts is a consistent and primary identification indicator. Note how dark gray the cap 2nd ed. First discovered near Philadelphia in 1842. The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection. The Philadelphia Vireo is a migrant in Tennessee, but is often overlooked because of its resemblance to the much more abundant Red-eyed Vireo in both plumage and voice. Philadelphia or Warbling Vireo? Most Warbling Vireos lack yellow on the throat but, when it feature, combined with a shorter neck and more rounded head, gives Philly Pt. Vireo philadelphicus This bird of the treetops is rather uncommon and often overlooked, or passed off as another vireo. Although only 90% sure on this ID, I believe this to be a Warbling Vireo. Rather plain, but with a cheery warbled song, the Warbling Vireo is a common summer bird in leafy groves and open woods from coast to coast. Warbling Vireos look quite similar to Tennessee Warblers and Philadelphia Vireos and thus require careful identification. Tennessee Warbler. This particular Warbling has a high-contrast face pattern and dark loral wedge but lacks the bluish-gray blush to the crown, as is typically seen on even the drabbest examples of Philadelphia Vireo. The Philadelphia vireo is similar in appearance to the warbling vireo, but can be reliably distinguished by having much yellower underparts, and dark lores. This variation can cause confusion among birders, who might identify a yellow-sided Warbling Vireo as a Philadelphia, while correctly identifying a paler Warbling Vireo, like the bird in my third photo (a bird banded at Sand Lake National Wildlife Refuge in South Dakota). Their photos greatly enhanced the educational value of this article. This Philadelphia Vireo was photographed by Richard Fray on 04 October 2020. This Warbling Vireo (left) illustrates how colorful a Warbling can be on its upperparts. Vireo philadelphicus are small, stocky vireos that appear very similar to Vireo olivaceus. identify vagrants. John Neville Bird Songs of Canada, Vol. This identification challenge is not necessarily straightforward, most especially when dealing with these two species flitting about in green, leafy vegetation on a sunny day! With Warbling Vireos, the opposite is true; the intensity of yellowish tone is weakest to the throat and upper breast area, greatest along the flanks and undertail. BirdForum - The net's largest birding community, dedicated to wild birds As always, the distribution of yellowish tone to the underparts is a consistent and primary identification indicator. Recorded in Poulsbo, Kitsap County, WA. The approximations given in the Sibley and Nat Geo guides, such as the dark wedge to the loral area (Philadelphia) or the lack of this feature (Warbling) are simply averages; Warbling Vireo can show a dark wedge-like mark to the loral area and some Philadelphia’s (esp. © Luke Seitz | Macaulay Library Maine, September 22, 2011 View Full Species Account (The type, or first, specimen of this bird was collected in Philadelphia.) It’s a great bird to learn by ear, because its fast, rollicking song is its most distinctive feature. Look for Philadelphia's dark line through the eye all the way to the bill; in Warbling Vireo … are much more common in early September (when Warbling Vireos are very Vireo a 'cuter' expression than the 'blank-faced' look of Warbling Vireo. It winters south of the Isthmus of Tehuantepec from south-central Chiapas to Nicaragua. Warbling or Philadelphia Vireo ( Vireo [gilvus or philadelphicus]) Avibase taxonomic concepts v. 01 (August 2013): Warbling or Philadelphia Vireo ( Vireo [gilvus or philadelphicus]) Avibase taxonomic concepts v. 02 (May 2014): Warbling or Philadelphia Vireo ( Vireo [gilvus or philadelphicus]) Typically, the Philadelphia Vireo plumage contains a unique, extensive warm yellow (generally strongest on the breast). Type of Resource. The brightest yellow is on their flanks, and their throats are white as opposed to yellow. My name is Jon Ruddy and I am an Ottawa-based field birder/freelance birding guide. The head has a gray cap, dark eyes, and white-bordered black eye-line. White-eyed vireo. when dealing with these two species flitting about in green, leafy veg. Because it avoids solid tracts of mature, unbroken forest, it is probably more common and widespread today than it was when the Pilgrims landed. Otherwise, Warbling Vireos are fairly plain birds with gray-olive upperparts and white underparts washed with faint yellow. Philadelphia also looks shorter-tailed and more round-headed in the near the eye, and, has a gray crown and green back contrast, and, shows a 'different' or 'cute' facial look than Warbling because the supercilium Red-eyed Vireos are larger than Warbling Vireos with a stronger face pattern in which the white eyebrow stripe is bordered above and below by black lines. Gift Certificates with Eastern Ontario Birding, Mass exodus of waterbirds out of James Bay, Eastern Ontario Birding - All text and photos © Jon Ruddy, unless otherwise indicated; all rights reserved. Profile by Glenn Olsen: During spring migration, most birders, including me, are excited to get out and see colorful warblers as they return from wintering grounds in Mexico, Central, and South America. Look for Philadelphia's dark line through the eye all the way to the bill; in Warbling Vireo … are much more common in early September (when Warbling Vireos are very Vireo a 'cuter' expression than the 'blank-faced' look of Warbling Vireo. Eyebrow is slightly paler than rest of head and underparts lack patterning. Gift Certificates with Eastern Ontario Birding, Mass exodus of waterbirds out of James Bay, Eastern Ontario Birding - All text and photos © Jon Ruddy, unless otherwise indicated; all rights reserved. With Warbling Vireos, the opposite is true; the depth of yellowish tone is lowest to the throat and upper breast area and highest along the flanks and undertail. Sibley, D. A. still image. This yellow is unique to this species (for good representation of this color, see Peterson 1961, or Godfrey 1966). This identification challenge is not necessarily straightforward, most especially when dealing with these two species flitting about in green, leafy vegetation on a sunny day!
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