Buff-cheeked Greenlet
Pachysylvia muscicapina
The buff-cheeked greenlet is 11.5 to 12 cm (4.5 to 4.7 in) long and weighs 9.5 to 13.5 g (0.34 to 0.48 oz). The sexes have the same plumage. Adults of the nominate subspecies have a gray-brown forehead and a blue-gray crown and nape. They have a buffy supercilium and blackish gray mottled ear coverts on an otherwise buffy-brown face. Their upperparts are greenish that is lighter on the rump. Their wings' primaries and secondaries are dark blackish gray with wide greenish edges on the outer webs. Their tail is dull greenish. Voice: The buff-cheeked greenlet's song is described as a "high, warbling weet-oh-weeréet".
ID text from Wikipedia, CC BY-SA 4.0
Rufous-naped Greenlet
Pachysylvia semibrunnea
The rufous-naped greenlet is 12 to 13 cm (4.7 to 5.1 in) long and weighs about 10 to 12.5 g (0.35 to 0.44 oz). The sexes have the same plumage. Adults have a rich rufous crown, nape, and ear coverts. Their lores, the area around their eyes, and their "moustache" are grizzled grayish white. Their upperparts are olive-green. Their wings' coverts are olive-green with paler edges. Their flight feathers and tail are dusky green with olive-green edges. Voice: One description of the rufous-naped greenlet's song is "a repeated, fast cheedodoweédidideét". Its call is "a descending series of 3-5 loud, harsh, scolding notes".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Buff-cheeked Greenlet and Rufous-naped Greenlet.