White-banded Tyrannulet
Mecocerculus stictopterus
The white-banded tyrannulet is 12.5 to 13 cm (4.9 to 5.1 in) long and weighs 8 to 11 g (0.28 to 0.39 oz). The sexes have the same plumage. Adults of the nominate subspecies have a medium gray crown. They have a white supercilium, a blackish stripe through the eye, and a faint dusky crescent behind the ear coverts on an otherwise whitish face. Their upperparts are dark brownish olive. Their wings are dark dusky with bright yellow to ochraceous edges on the flight feathers. Their wing coverts have wide pure white tips that show as two bars on the closed wing. Their tail is dusky olive. Voice: What is thought to be the white-banded tyrannulet's song is "a rising, wheezy rhzeee?, sometimes followed by a rich chew-bit or a scratchy, thin, rising-falling chatter".
ID text from Wikipedia, CC BY-SA 4.0
White-tailed Tyrannulet
Mecocerculus poecilocercus
The white-tailed tyrannulet is about 11 cm (4.3 in) long and weighs 10 to 11 g (0.35 to 0.39 oz). The sexes have the same plumage. Adults have a medium gray crown. They have a thin white supercilium and a faint blackish stripe through the eye on an otherwise whitish face. Their upperparts are mostly greenish olive with a bright greenish yellow rump and uppertail coverts. Their wings are dusky with pale yellow edges on the flight feathers. Their wing coverts have white to pale buff tips that show as two bars on the closed wing. Voice: The white-tailed tyrannulet's dawn song is "a high, lisping pseeee-psweet". Its day song is "a descending series of high, rising, sibilant whistles: PSEE pswee pswee psweet" that sometimes ends with "sharper pit 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: White-banded Tyrannulet and White-tailed Tyrannulet.