Hutton's Vireo
Vireo huttoni
Hutton's vireo is 10 to 12 cm (3.9 to 4.7 in) long and weighs about 9 to 15 g (0.32 to 0.53 oz). The sexes have the same plumage. Adults of the nominate subspecies V. h. huttoni have an olive crown and nape, pale lores, a wide, broken, pale whitish eye-ring, and pale olive ear coverts. Their upperparts are olive that becomes greener on the rump. Their wing coverts are dusky olive with wide pale yellowish olive tips that show as two wing bars. Their remiges and rectrices are dusky brownish to blackish with pale yellowish olive edges on the outer webs. Voice: The song of Hutton's vireo is highly variable among individuals and populations. The general pattern is "a monotonous and unmusical series of nasal and wheezy 2-syllable, ascending phrases: zu-wee.....zu-wee.....zu-wee.....zu-wee.....". Some variations are "descending phrases: zee-ooo.....zee-ooo.....zee-ooo.....zee-ooo......", mixed "ascending and descending phrases in the same series: zu-wee....
ID text from Wikipedia, CC BY-SA 4.0
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
Where you might meet both
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