Ecuadorian Tyrannulet
Phylloscartes gualaquizae
The Ecuadorian tyrannulet is about 11.5 cm (4.5 in) long; one male weighed 8 g (0.28 oz). The sexes have the same plumage. Adults have an indistinct whitish supercilium and eye-ring. Their face is otherwise mostly pale yellow to whitish with an indistinct blackish line around the ear coverts. Their crown is gray and the rest of their upperparts are olive. Their wings are dusky with pale yellow edges and tips on the flight feathers. Their wing coverts are dusky with whitish to pale yellow tips that form two wing bars. Their tail is olive. Voice: The Ecuadorian tyrannulet's day song is "a spitting, almost rattled trill, sp-i-i-i-i-i-i, that at first descends, then ascends, then descends again" and has also been written as "dzEEeerrrrEEerrrrr". Its calls include "a thin feeee" and "high teep and ptip notes".
ID text from Wikipedia, CC BY-SA 4.0

Rufous-browed Tyrannulet
Phylloscartes superciliaris
The rufous-browed tyrannulet is 9.5 to 12 cm (3.7 to 4.7 in) long; three individuals weighed 7 to 9 g (0.25 to 0.32 oz). The sexes have the same plumage. The forecrown and lores of nominate adults are bright chestnut that extends to the rear as a thin supercilium. They have a small white spot at the base of the bill. Their ear coverts are white with a thin but conspicuous black border and the rest of their face is grizzled whitish. Their crown is pearly gray and the rest of their upperparts are bright olive. Their wings are dusky olive with yellowish green edges on the flight feathers. Voice: The rufous-browed tyrannulet's song is variously described as a "lively and arresting...wiss, wreewreewreewreewree and wree tititititi", "a spritely spee-ee-ee-ee-ee, spee-dididee", and "a high, springy, laughing chatter that quavers: chi chi tchrrEE'EE'ee'EE'EE'eew or shorter tchwee tchwee ti-titititew". Its call is "a sharp, emphatic screesh" or "a high tchwee".
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: Ecuadorian Tyrannulet and Rufous-browed Tyrannulet.