Planalto Tyrannulet
Phyllomyias fasciatus
The planalto tyrannulet is 11 to 11.5 cm (4.3 to 4.5 in) long. The sexes have the same plumage. Adults of the nominate subspecies have dull grayish-olive to brownish-olive crowns, napes, backs, and rumps, with the crown being the grayest part. Their lores, supercilium, partial eyering, and lower face are whitish with a dark stripe through their eye. Their wings are dusky with pale olive to whitish edges to the flight feathers and the ends of the coverts; the latter show as two pale bars on the closed wing. Their tail is dusky. Voice: The planalto tyrannulet's song differs geographically. In the southeastern part of its range it sings "a slow series of 3-4 slightly descending, plaintive 'puh-puh--' minor-key notes". Elsewhere it sings a "slightly higher-pitched and more distinctly descending series of 3 more major-keyed notes".
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: Planalto Tyrannulet and Sooty-headed Tyrannulet.