Grey-chested Greenlet
Hylophilus semicinereus
The grey-chested greenlet is about 12 cm (4.7 in) long; one individual weighed 13 g (0.46 oz). The sexes have the same plumage. Adults of the nominate subspecies have a grayish green forehead and a grayer crown. Their lores and the sides of their face are buffy and their ear coverts gray-buff. Their upperparts are greenish. Their wings' primaries and secondaries are blackish gray with greenish edges and the tertials are blackish gray with yellow edges on the inner webs. Their tail is dull olive-green with brighter green edges on the feathers. Voice: The grey-chested greenlet's song is a "very high, hurried wee-wee-wee... (about 8-20 x, but often too fast to count".
ID text from Wikipedia, CC BY-SA 4.0
Grey-eyed Greenlet
Hylophilus amaurocephalus
The grey-eyed greenlet is 12.5 to 13 cm (4.9 to 5.1 in) long. The sexes have the same plumage. Adults have a chestnut-brown forehead and crown and a pale grayish supercilium, and is mottled gray-white around the eye and on the ear coverts. Their nape and upper back are dull gray-brown and their lower back, shoulders, and rump are green-tinged gray-brown. Their wings are gray-brown with thin greenish edges on the outer webs of the primaries and secondaries. Their tail is gray-green with brighter edges on the feathers' outer webs. Voice: The grey-eyed greenlet's song is a "high, rather harsh see-see or te Teé-te Teé-te Teé and many other variations".
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: Grey-chested Greenlet and Grey-eyed Greenlet.