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
Grey-headed Elaenia
Myiopagis caniceps
The grey-headed elaenia is 12 to 14 cm (4.7 to 5.5 in) long and weighs 9.5 to 17 g (0.34 to 0.60 oz). Adult males have a medium gray crown with a partially concealed white stripe along its middle. They have an indistinct whitish loral spot and a grizzled whitish lower face. Their upperparts are olive gray. Their wings are black with white edges on the inner flight feathers and white tips on the coverts; the last form two bars on the closed wing. Their tail is grayish. Their throat is white, their breast pale gray, and their belly grayish white. Adult females are smaller than males. Voice: The grey-headed elaenia's main vocalization is a "series of varying length, starting with 2-4 single/extr. high notes, then gliding down and accelerating to a long trill, slowing down and often finishing with some up-and-down, lilting notes". The species typically vocalizes the most in the early morning but continues intermittently all day; it vocalizes from the forest canopy.
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 Grey-headed Elaenia.