Slate-throated Whitestart
Myioborus miniatus
The slate-throated whitestart is a long-tailed warbler measuring 12 cm (4.7 in) long. It has a deep rufous head, dark back, and contrasting bright yellow breast, belly and white vent and tail tips. The bill is black, and the legs are blackish-gray. While most of its plumage changes little throughout its large range, the underparts grade from yellow in most of its range, to red in the northernmost part.
ID text from Wikipedia, CC BY-SA 4.0

Spectacled Whitestart
Myioborus melanocephalus
The spectacled whitestart generally weighs between 10 and 13 grams, and is between 13 and 13.5 centimetres (5.1 and 5.3 in) long. The species has a black face and crown, while the nape of the neck and the back are grey. The tail is largely black, but the outermost feathers have some white on them. The underside of the throat, from the throat to the tail, is yellow. The undertail coverts are white. The beak and the legs are black, while the iris is dark. Males and females are indistinguishable. Juveniles have grey on the head and back, and have an underside that is paler yellow.
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: Slate-throated Whitestart and Spectacled Whitestart.