Scarlet-rumped Cacique
Cacicus uropygialis
The scarlet-rumped cacique is sexually dimorphic like many Icteridae, though it mainly concerns size in this species. Males are 23 cm (9 in) long and weigh 68 g (2.4 oz), while the female is 20 cm (8 in) long and weighs 53 g (1.9 oz); This cacique is a slim long-winged bird, with a relatively short tail, blue eyes, and a pale yellow pointed bill. It has mainly black plumage, apart from a scarlet patch on the lower back and upper rump. The female is smaller and a duller black than the male, and the juvenile bird has a brownish tone to the plumage and a brownish-orange rump.
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: Scarlet-rumped Cacique and Yellow-billed Cacique.