Grey Monjita
Nengetus cinereus
The grey monjita is 21 to 25 cm (8.3 to 9.8 in) long and weighs 50 to 62 g (1.8 to 2.2 oz). The sexes have the same plumage and the two subspecies are essentially alike. Adults have a mouse-gray or dusky grayish crown, a wide white stripe from the lores to above the eye, and a thin white "moustache" with a wider black stripe below it. Their upperparts are mouse-gray or dusky grayish. Their wings are black with wide white bases to the primaries that show in flight. Their wing coverts have white tips and the tertials have white edges. Their tail is black with wide white tips on the feathers. Voice: The grey monjita's song has been described as a "very high, soft weeh-tjuh-teeh" and its call as a "very high, thin weéh". Other descriptions are "pééehpééeh-ili, dew-dlee-ew" and "pééa" respectively.
ID text from Wikipedia, CC BY-SA 4.0
Lesser Elaenia
Elaenia chiriquensis
The lesser elaenia is 13 to 14 cm (5.1 to 5.5 in) long and weighs 11.5 to 22 g (0.41 to 0.78 oz). It is a small elaenia with a small squarish crest. The sexes have the same plumage. Adults of the nominate subspecies have a grayish olive head with lighter cheeks, a thin whitish eyering, and a partially hidden white patch on the crown. Their upperparts are grayish olive. Their wings are mostly dusky with whitish edges on the flight feathers. The tips of the coverts are white and show as two wide bars on the closed wing. Their tail is dusky. Voice: The lesser elaenia's dawn song is a "very high, hurried, 'tju-wee tju-weederwee' " whose "wee" notes are higher than the others. It has many calls including "a clear, whistled 'weeééa' " and a "burry 'beer-ta' or 'chí-bur' or 'jwebu' ", and "a longer 'freee' ".
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 Monjita and Lesser Elaenia.