Dusky-green Oropendola
Psarocolius atrovirens
The male dusky-green oropendola grows to a length of about 42 cm (17 in) and the female of about 33 cm (13 in). The sexes are similar in morphology, the plumage being mainly dark brownish-green or blackish-green, with a rufous-brown rump and crissum (the undertail coverts surrounding the cloaca). The beak is greenish-white, there may be a few yellow feathers on the head, and the iris is brown or blue, the latter colour perhaps appearing in older birds.
ID text from Wikipedia, CC BY-SA 4.0
Green Oropendola
Psarocolius viridis
Male green oropendolas average 48.5 cm (19 in) long and females 37 cm (15 in). Males average 405 g (14 oz) and females 215 g (7.6 oz). Adult males have long feathers on their nape that form a crest. Females lack the crest but are otherwise like males. Adults are mostly yellowish olive. They are pink to dull orange on the lores and around their eye. Their wings are dusky olive and their rump, uppertail coverts, belly, thighs, and crissum are chestnut. Their central pair of tail feathers are dusky olive and the rest yellow with dusky olive outer edges on the outermost pair. Voice: The male green oropendola's song is "variable and complex". They "commonly start with a descending whistle (barely audible at distance) and/or rattling sounds". A lyrical description calls it "a rapid, squealing, and liquid Qu-Q-Q-q-q-q-qD'D'D'CLOCK, agoogoo, 1st part like a giant spring stretching, then dull sticks knocking, last par a mellow hooting".
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: Dusky-green Oropendola and Green Oropendola.