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
Olive Oropendola
Psarocolius bifasciatus
The olive oropendola is the largest member of its genus. Males are about 47 to 53 cm (19 to 21 in) long and females 34 to 38 cm (13 to 15 in). Adult males have long feathers on their nape that form a crest. Females lack the crest but are otherwise like males except for their smaller size and somewhat duller plumage. Adults of the nominate subspecies P. b. bifasciatus have a blackish brown head, neck, and upper breast that combined look like a hood. They have a patch of bare pinkish skin on their face.
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: Green Oropendola and Olive Oropendola.