Grey-capped Tyrannulet
Phyllomyias griseocapilla
The grey-capped tyrannulet is about 11 cm (4.3 in) long. The sexes have the same plumage. Adults have a slate-gray crown and nape and bright olive-green back and rump. Their lores and eye area are white with a faint dusky stripe through their eye. Their lower face is pale gray. Their wings are dusky with bright yellow edges on the flight feathers and the ends of the coverts; the latter show as two wing bars. Their tail is dusky olive. Their throat is grayish white, their breast pale gray, their flanks bright yellow-green, and their belly whitish. Voice: The grey-capped tyrannulet's song is a "short series of 1-4 high, clear, whistled 'weew--' notes". Its call is a "high, clear, drawn-out, rising 'weeeew' ".
ID text from Wikipedia, CC BY-SA 4.0
Sooty-headed Tyrannulet
Phyllomyias griseiceps
The sooty-headed tyrannulet is about 10 cm (3.9 in) long and weighs about 8 g (0.28 oz). The sexes have the same plumage. Adults have a grayish to blackish crown and dull grayish olive nape, back, and rump. Their lores and supercilium are white with a dark stripe through their eye. Their lower face is grizzled. Their wings are dusky with narrow whitish edges to the inner flight feathers and the ends of the coverts. Their tail is dusky. Their throat is grayish white, their breast and flanks pale olive, and their belly bright yellow. Voice: The sooty-headed tyrannulet often sings from an open perch. Its song varies geographically, but in general is "an emphatic phrase of clear, short whistled notes, first one stressed, 'whip, whip-di-irip' or 'whit, whit-wheeu' ".
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-capped Tyrannulet and Sooty-headed Tyrannulet.