Philadelphia Vireo
Vireo philadelphicus
Adults are mainly olive-brown on the upperparts with yellow underparts; they have dark eyes and a grey crown. They have no wing bars and no eye ring. There is a dark line through the eyes and a white stripe just over them. They have thick blue-grey legs and a stout bill. The Philadelphia vireo is similar in appearance to the warbling vireo, but can be reliably distinguished by having much yellower underparts, and dark lores.
ID text from Wikipedia, CC BY-SA 4.0
Plumbeous Vireo
Vireo plumbeus
The plumbeous vireo is 12.4 to 13.8 cm (4.9 to 5.4 in) long and weighs about 12 to 20 g (0.42 to 0.71 oz). The sexes have the same plumage. Adults of the nominate subspecies V. p. plumbeus have a neutral gray crown and nape, a wide white stripe above the lores, a wide white eye-ring, a dusky stripe through the eye-ring, and neutral gray ear coverts. Their upperparts are neutral gray with an olive-green tinge on the rump. Their wing coverts are blackish gray with whitish tips that show as two wing bars. Their remiges are blackish gray with pale olive gray edges. Voice: The male plumbeous vireo's primary song is a "jerky series of burry phrases, separated by pauses often alternates between ascending and descending phrases: ch'reeh ch'roo ch'reeh ch'roo or ch'ree chi-ri'eet ch'ree ch'ree-oo". Another song is a "complicated jumble of chattering, warbling, and singing in rapid and apparently random combinations". The species' calls include an "rasping chatter...
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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