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
Lemon-chested Greenlet
Hylophilus thoracicus
The lemon-chested greenlet is 10 to 13 cm (3.9 to 5.1 in) long and weighs 11 to 14 g (0.39 to 0.49 oz). The sexes have the same plumage. Adults of the nominate subspecies H. t. thoracicus have an ochraceous olive forehead, a dull grayish olive crown, and a wide grayish nape collar. They have grayish lores and sides of the head with a greenish tinge on the ear coverts. Their upperparts are bright olive that often has a yellowish tinge. Their wings' coverts and flight feathers are dull blackish gray with wide bright olive to yellowish green edges on the latter. Voice: The lemon-chested greenlet's song is a "very high, rapid series of 10-15 upslurred tu-Weéet notes". Its call is a "rich, whistled where-it sometimes doubled ".
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 Lemon-chested Greenlet.