The male is in average 28 cm long and weighs about 104 g, with the female 23 cm long and weighing 60 g approximately. The Yellow-rumped Cacique is a slim bird, with a long tail, blue eyes, and a pale yellow pointed bill. It has mainly black plumage, apart from a bright yellow rump, tail base, lower belly and wing epaulets. The female is duller black than the male, and the juvenile bird resembles the female, but has dark eyes and a brown bill base.
Habitat and Distribution
The Yellow- rumped Cacique breed in much of northern South America from Panama and Trinidad south to Peru, Bolivia and central Brazil. However, have been sighted as far north as Nayarit, Mexico. They associated with open woodland or cultivation with large trees.
This gregarious bird eats large insects and fruit.
The bird is a colonial breeder, with up to 100 bag-shaped nests in a tree. The females build the nests, incubate, and care for the young. Each nest is 30 to 45 cm long and widens at the base, and is suspended from the end of a branch. Females compete for the best sites near the protection of wasps. The normal clutch is two dark-blotched pale blue or white eggs. Females begin incubating after laying the second egg; hatching occurs after 13 or 14 days. The young fledge in 34 to 40 days.
Calls and Songs
The song is a brilliant mixture of fluting notes with cackles and wheezes and sometimes mimicry. They also have many varied, loud calls.