White-lored Gnatcatcher
Polioptila albiloris
The white-lored gnatcatcher is 11 to 12 cm (4.3 to 4.7 in) long and weighs 6 to 9 g (0.21 to 0.32 oz). The nominate male in breeding plumage has a black cap down to the eyes and including the nape. The rest of the upperparts are bluish gray. The tail is black with white outermost feathers. The throat is white becoming pale bluish gray on the breast and flanks. The female has a dark gray cap and the eponymous white lores and supercilium. The juvenile is similar to the female but has browner upperparts. The male P. a. vanrossemi has a larger black cap and longer wings and tail than the nominate. Voice: The white-lored gnatcatcher has two songs, a "simple" and a "complex" . It also has a variety of calls, for which see Xeno-canto below.
ID text from Wikipedia, CC BY-SA 4.0
Yucatan Gnatcatcher
Polioptila albiventris
The Yucatan gnatcatcher is 10 to 12 cm (3.9 to 4.7 in) long. Six males weighed 5.4 to 6.2 g (0.19 to 0.22 oz) and three females 5.0 to 5.7 g (0.18 to 0.20 oz). The female's upperparts are plumbeous gray from the crown to the rump. Its underparts are white with sometimes a pale grayish wash on the flanks. The tail's central feathers are black and each pair out from them are progressively more white until the all white outermost pair. It has a narrow white supercilium. The male's basic (non-breeding) plumage is essentially the same. Voice: The Yucatan gnatcatcher has two songs, a low-pitched nasal one and a higher-pitched clearer one. Both are in this recording: .
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-lored Gnatcatcher and Yucatan Gnatcatcher.