Golden-fronted Greenlet
Pachysylvia aurantiifrons
The golden-fronted greenlet is 11 to 12 cm (4.3 to 4.7 in) long and weighs an average of 9.5 g (0.34 oz). The sexes have the same plumage. Adults of the nominate subspecies have an ochre-olive forehead and a buffy brown crown. Their upperparts are greenish brown that is more yellowish green on the rump. Their wings' coverts are greenish brown and their primaries and secondaries are dull blackish gray with thin greenish edges on the outer webs. Their tail is dull olive-green. Their chin and throat are whitish buff, their breast grayish yellow, and their belly and vent yellowish. Subspecies P. Voice: The golden-fronted greenlet's song is "a short, quick, semimusical de-wichy-de-whéter, often over and over". Its calls include a "double note, chee-vee, and chattering or chirping note".
ID text from Wikipedia, CC BY-SA 4.0
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
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: Golden-fronted Greenlet and Lesser Greenlet.