Austral Blackbird
Curaeus curaeus
Its plumage is entirely black with a slight bluish hint, and its physical features consist of black legs, black eyes, and a sharp beak with missing pigmentation in the head, chest, and wings. Compared to other birds in its family, the Austral Blackbird has a highly varied voice, and they do a lot of singing and calling together.
ID text from Wikipedia, CC BY-SA 4.0
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
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Play BeakBrainPhotos and recordings are credited to their authors under the licence shown. Full profiles: Austral Blackbird and Chestnut-headed Oropendola.