Lesser Greenlet
Pachysylvia decurtata
The lesser greenlet is 9.4 to 10.2 cm (3.7 to 4.0 in) long and weighs 6.6 to 10.3 g (0.23 to 0.36 oz). The sexes have the same plumage. Adults of the nominate subspecies have a gray-blue crown and upper face. They have grayish lores, a whitish eye-ring, and often a pale stripe above the lores. Their upperparts are olive-green that is lighter on the rump. Their wings' primaries and secondaries are dark grayish with bright greenish outer webs. Their tail is grayish green. Voice: The lesser greenlet's song is "a pleasant, rather quiet series of 2–3 phrases, continuously repeated and then changing into different motif, chi-chi-cher cher cher". Its calls include "a faint churr or a dry, rolled rattle, and various harsh, scolding nasal notes".
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: Lesser Greenlet and Rufous-naped Greenlet.