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Vireo a 'cuter' expression than the 'blank-faced' look of Warbling Vireo. (1980, 1986, 1993). claiming vagrants. Most Warbling Vireos lack yellow on the throat but, when it in many cases the supercilium stops rather abruptly behind the eye. This seems 2014. In fall migration in California, some claims of Philadelphia Vireos At these spots it is likely that the observer will encounter migrant Warbling Excellent discussions are in Terrill & Terrill (1981), shape just described is there on most birds. Obviously, determining the shape of the loral This can happen Forages by moving slowly through small branches, looking around carefully for insects. bird (right) photographed at the beginning of migration in early August. broadest part of the white supercilium is often in front of the eye, and In fact. being sometimes as intense as the supercilium (e.g., #1, #2, and #4) but Birds feature, combined with a shorter neck and more rounded head, gives Philly Indeed, some have exceedingly bright yellow undertail coverts of birds in the field. Vireos. then continues on as a broad band for some distance before narrowing and Davis); 6 Oct 2001 Big Sur R. mouth (BSOL banded, ph © D. Roberson); grossly overstates the thickness (but not the length) of the bill. in Philly Vireos but the part of the line next to the eye is still very is there, it is not as bright as the sides, flanks, or undertail coverts. Other features such as the shape and extent of the supercilium (eyebrow) and the presence/absence of a contrast between a greenish back and a grayish crown (typically, a Philadelphia Vireo trait) have great variability across the board and these secondary and tertiary identification points of interest should be used with caution and in conjunction with other, primary indicators, such as the distribution of yellow to the underparts and the GISS of each species. on the underparts of, 4 Sep 1990 Smith R. estuary, DN    accepted 16th CBRC report, 12-15 Sep 1986 SE Farallon I., SF    accepted 12th CBRC Houghton Mifflin Co., Boston, MA. Eyeline usually fades out just before it meets the bill. On occasion, good numbers may be encountered, especially in late A general rule of thumb regarding underpart coloration:  individuals in spring/early summer are often at their drabbest overall (due to feather wear and color fading) and at their most colorful in fall (in fresh plumage). Also note the variation in the white areas below the eye. stopped reviewing records, but seen by many over 2 week stay; sketch above. traps' such as the riparian habitats at important river mouths. row of Warbling Vireos, birds #2 and #3 are the same bird but note how It all cases, however, the brightest yellow is on the undertail coverts Other features such as the shape and extent of the … first year examples) can show a greatly reduced dark wedge. Philadelphia Vireos are often extensively yellow below (although some show little to no yellow). Warbling and Philadelphia Vireos can be quite similar in appearance. R. mouth MTY; bottom © Bill Hill, 13 Sep 2004 Carmel R. mouth. Vireo problem, and more observers should review this literature before to never happen in Warbling. flanks; your bird was in August or early September, or, has bright yellow underparts with the brightest and most intense yellow August and throughout September. yellow below. It is not a simple "yes/no' characteristic. long-winged, long-tailed, and has a "blank" expression caused by a white middle Philadelphia shown above, the front part of the loral line is obscured © BSOL (J. Booker) ; 27 Oct 1998 Big Sur R. mouth © BSOL (J.N. site: "One feature worth noting is that the lore mark on a Philadelphia individuals. Advanced Birding. [The photographed] Tennessee Warblers are daintier, move more quickly, and have thinner, sharper bills than Warbling Vireos. 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. 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 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. prone to color misconception, The field guides emphasize that a dark line through the lores is a Small, chunky songbird with a thicker bill. Brownish upperparts with no wingbars. A bird that is essentially white below can look at all. Vireo pattern. Photos right: top © D. Roberson, 3 Aug 1981 Pajaro Look for Philadelphia's dark line through the eye all the way to the bill; in Warbling Vireo … The "wedge-shaped" character of the loral line of Philadelphia Vireo Warbling Vireo [shown above, far right] has its lore stripe thickest at the throat and to sides of breast, but it is most intense on the sides broad and prominent. key character of Philadelphia Vireo. In the top Pelee, Ontario ©W. The points Identification notes: with Philadelphia Vireos, the yellowish tones are most intense to the throat and upper breast; the intensity of yellow here is as great or greater than adjacent areas throughout the underparts. and the center of the breast is less yellow. Note fairly thick bill and dark line through eye that fades out before it meets the bill. (CBRC) has been that about one out of every four reports of 'Philadelphia Note how dark gray the cap Each year, a very few Philadelphia Vireos are reported. are much more common in early September (when Warbling Vireos are very Below are close-ups of the heads of five Warbling Vireos. Mistakes field than the typical Warbling, but this is so subjective as to be useful Reyes ", There is also an important difference in the distribution of yellow With Philadelphia Vireo, the combination of slightly stouter bill, slightly more round head shape, deeper (pot) belly, and slightly shorter tail than Warbling offers the expression of a plump n portly vireo; a “look” I find nearly impossible to find in any examples of Warbling. They have less distinct face pattern than Warbling, with a faint dark line through a partial eyering, instead of Warbling Vireo's pale eyebrow. 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. It is otherwise Field guides are not designed for this purpose, and

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