Chestnut-headed Oropendola
Psarocolius wagleri
Chestnut-headed oropendola males average 35 cm (14 in) long and females 28 cm (11 in). Males weigh an average of 214 g (7.5 oz) and females 113 g (4.0 oz). The species looks very long-winged in flight. Males have a slight crest. Adult males of the nominate subspecies have a dark purplish chestnut head, throat, and upper breast. Their body and wings are mostly black with a bluish gloss. Their rump and uppertail coverts are dark chestnut and their rear flanks and undertail coverts a medium chestnut.
ID text from Wikipedia, CC BY-SA 4.0
Crested Oropendola
Psarocolius decumanus
Male crested oropendolas of the nominate subspecies P. d. decumanus average 47 cm (19 in) long and females 37 cm (15 in). Males weigh about 285 g (10 oz) and females about 160 g (5.6 oz). Adult males have long feathers on their nape that form a crest. They are mostly a slightly glossy black with a chesnut rump, uppertail coverts, and undertail coverts. Their central pair of tail feathers are black and the rest yellow. Adult females are overall duller than males; they are brownish tinged rather than pure black and have a minimal crest. Voice: The male crested oropendola's display song "usually starts with low-pitched liquid notes, accelerates into variable and complex rattling crescendo, and ends with 2–3 seconds of rhythmic wing-flaps". One description calls it "very complex, including very high, rapid, staccato flutes and liquid curls".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play BeakBrainPhotos and recordings are credited to their authors under the licence shown. Full profiles: Chestnut-headed Oropendola and Crested Oropendola.