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
Olivaceous Greenlet
Hylophilus olivaceus
The olivaceeous greenlet is 12 cm (4.7 in) long and weighs 11 to 13 g (0.39 to 0.46 oz). The sexes have the same plumage. Adults have a yellowish olive forehead. The rest of the top of their head and their upperparts, wings, and tail are dull olive-green. Their underparts are yellowish olive that is slightly lighter on the chin and a slightly brighter yellow on the belly. They have a whitish iris, a dull pink or brownish pink bill, and brownish pink legs and feet. Voice: The olivaceous greenlet's song has been described as a "distinctive and loud...series of up to 10-12 musical suwee or peer notes". Another description is "a single note repeated in a series, for example: wee wee wee wee wee wee wee".
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 Olivaceous Greenlet.