Giant Cowbird
Molothrus oryzivorus
The male giant cowbird is 34 cm (13 in) long, weighs 174–242 g (6.1–8.5 oz) and is iridescent black, with a long tail, long bill, small head, and a neck ruff which is expanded in display. The female is smaller, averaging 29 cm (11 in) in length and weighing 144–167 g (5.1–5.9 oz). The female is less iridescent than the male, and the absence of the neck ruff makes her look less small-headed. Juvenile males are similar to the adult male, but browner, and with a pale, not black, bill.
ID text from Wikipedia, CC BY-SA 4.0
Yellow-billed Cacique
Amblycercus holosericeus
Yellow-billed cacique males are about 21.5 cm (8.5 in) and females about 20.5 cm (8.1 in) long. Males of subspecies A. h. holosericeus and A. h. flavirostris weigh an average of 69 g (2.4 oz) and females 53 g (1.9 oz). Males of subspecies A. h. australis weigh an average of 50 g (1.8 oz) and females 47 g (1.7 oz). Adult males of all three subspecies are entirely black and females are a slightly slaty black. Both sexes have a pale yellow iris and gray legs and feet. Juveniles are duller than adults and have a dark iris. All subspecies have a long bill whose tip is chisel-shaped. Voice: Pairs of yellow-billed caciques duet. Males sing "a loud Teeer-purr'weeuur!-Teeer-purr'weeuur-Teeer-purr'weeuur-Teeer-purr'weeuur..." and females reply with a "long down-slurred whistle, followed by a harsh nasal chatter". Their call is "a husky, burry scolding". In the western lowlands of Ecuador males sing "a series of loud ringing whistled notes, e.g. pee!-pee!-peeo-peeo-peeo...".
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: Giant Cowbird and Yellow-billed Cacique.