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
Rufous-crowned Greenlet
Hylophilus poicilotis
The rufous-crowned greenlet is about 12.5 cm (4.9 in) long and weighs 9 to 12 g (0.32 to 0.42 oz). The sexes have the same plumage. Adults have a bright chestnut-brown forehead and crown and mottled grayish black ear coverts. Their nape, upper back, and shoulders are olive-green and their lower back and rump are a brighter green. Their wings are dull grayish black with thin greenish edges on the outer webs of the primaries and secondaries and yellow-green edges on the inner webs of the tertials. Their tail is grayish green with brighter greenish edges on the feathers' outer webs. Voice: The rufous-crowned greenlet's song is a "rapid, high teweét-teweét- - (3-6 x) or rapid swee-swee- - (4-5 x)". There is much variation throughout the species' range. When it groups it makes chek or chi-chek contact calls.
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: Lemon-chested Greenlet and Rufous-crowned Greenlet.