Mountain Elaenia
Elaenia frantzii
The mountain elaenia is 14 to 15 cm (5.5 to 5.9 in) long and weighs about 14 to 24 g (0.49 to 0.85 oz). It is a small to medium size elaenia with a rounded crest. The sexes have the same plumage. Adults of the nominate subspecies have a brownish olive head with lighter cheeks, a thin very pale olive eyering, and a mostly hidden white patch on the crown. Their upperparts are grayish olive. Their wings are mostly dusky with pale olive or olive-yellow edges on the flight feathers. The tips of their wing coverts are yellowish olive and show as two bars on the closed wing. Voice: The northern and southern pairs of subspecies of the mountain elaenia have somewhat different vocalizations, which is part of the evidence hinting that they are separate species. The dawn song of the northern pair is "an endless repetition of an overslurred whistle followed by a rising burry part and a higher-pitched second overslurred note, all three notes interconnected without a clear pause".
ID text from Wikipedia, CC BY-SA 4.0
Small-billed Elaenia
Elaenia parvirostris
The small-billed elaenia is 13 to 15 cm (5.1 to 5.9 in) long. It is a small elaenia without a crest. The sexes have the same plumage. Adults have a bright olive-green crown with a partially visible white stripe in the middle. They have whitish lores and a thin but distinct white eyering. Their upperparts are bright olive-green. Their wings are dusky with whitish tips on the coverts that show as three wing bars. Their flight feathers have narrow whitish edges. Their tail is dusky. Voice: The small-billed elaenia's dawn song is "a stuttering, deep, gravelly PEE-jip-p'p'jooee?". It has also been written as a "hurried, strong 'Wee-dr-dee-wuh' ". It is mostly silent on its wintering grounds but does make "a soft 'cheeu' " call there.
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: Mountain Elaenia and Small-billed Elaenia.