Hutton's Vireo

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....