
Elaenia is a genus of passerine birds in the tyrant flycatcher family which occur in Mexico, the Caribbean, and Central and South America. Except by voice, specific identification is often difficult since many species are very similar. Elaenia flycatchers are typically brownish, greyish or olive above, and off-white and/or pale yellow on the belly...
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http://en.wikipedia.org/wiki/Elaenia

(genus Elaenia), any of about 20 species of plain-coloured New World flycatchers, family Tyrannidae (order Passeriformes), with a short bill and ...
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http://www.britannica.com/eb/a-z/e/16

any of numerous tropical American flycatchers of the genus Elaenia, having short crests and small bills.
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https://www.infoplease.com/dictionary/elaenia
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