Golden-crowned Warbler
Basileuterus culicivorus
The golden-crowned warbler is 12.0–13.5 cm (4.7–5.3 in) in overall length. It has grey-green upperparts and bright yellow underparts. The head is grey with a black-bordered yellow crown stripe, a yellow or white supercilium and a black eyestripe. Sexes are similar, but the immature golden-crowned warbler is duller, browner and lacks the head pattern other than the eyestripe. The subspecies fall into four groups.
ID text from Wikipedia, CC BY-SA 4.0

Three-striped Warbler
Basileuterus tristriatus
The three-striped warbler measures 13 cm (5.1 in) in length. It is mostly olive-brown with a buffy belly and underparts. It has distinct black and white striping on the head and a dark cheek. Male and female three-striped warblers have similar plumages. Their song is a rapid series of squeaky chirps.
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: Golden-crowned Warbler and Three-striped Warbler.