Greenish Elaenia
Myiopagis viridicata
The greenish elaenia is 13 to 14 cm (5.1 to 5.5 in) long and weighs 11 to 13 g (0.39 to 0.46 oz). The sexes have essentially the same plumage. Adults of the nominate subspecies M. v. viridicata have a greenish olive crown with a faint grayish tinge and a partially concealed bright yellow stripe along its middle. (Males have a larger yellow patch than females.) Adults have a dark loral streak, a whitish gray supercilium, a partial white eyering, and grizzled whitish ear coverts. Their upperparts are olive-green. Voice: The greenish elaenia's dawn songs and daytime calls seem to fall into four groups. The population in western Mexico sings a "high-pitched sweet tsewee-tseee....g'tseewe...tsewee-tseee...g'tseewe.... typically alternating a two-note and a one-note phrase". Its call is a "high-pitched two-note descending tsee-tseeu". The population in eastern Mexico sings a "moderately high pitched g'tswee-ee-ut...
ID text from Wikipedia, CC BY-SA 4.0
Spectacled Tyrant
Hymenops perspicillatus
The spectacled tyrant is 13 to 16 cm (5.1 to 6.3 in) long and weighs about 20 to 25 g (0.71 to 0.88 oz). Adult males of the nominate subspecies are mostly black. Their primaries are mostly white with black bases and tips. They have bare, fleshy, green-tinged yellow skin around the eye that gives the species its English name. Adult females have a dark brown crown, a buffy or buff-white supercilium, pale lores, and a smaller eye-ring than males on otherwise mostly pale dusky face. Their back is dark brown with black streaks.
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: Greenish Elaenia and Spectacled Tyrant.