Unicolored Blackbird
Agelasticus cyanopus
Medium-sized blackbird with a long, thin bill that is found in marshes and reedbeds. Males are all black, whereas females are highly variable across their range. Northern females from Amapá, Pará, Maranhão, and French Guiana are mostly black with an olive belly. Those from southeast Brazil are dark brownish olive above and dark yellow below. Those from central-southern South America are brown above with black streaks, a faint yellow eyebrow, and yellow underparts. The song is a rattle followed by a series of trills.
Identification
The male unicolored blackbird is befitting of its name, with entirely glossy black plumage and dark eyes. However, the species exhibits sexual dimorphism; the female is streaked brown and black with a yellow belly streaked with brown. The face has a dark mask and the wings are reddish-brown edged with black. Females from the lower Amazon region and southeastern Brazil have a generally duller colouration with less rufous wings and less yellow underparts. The legs and the iris are black and the bill is long and sharply pointed. The male could be confused with the velvet-fronted grackle or the chopi blackbird. Its call of this bird is a loud "tchew-tchew-tchew" which is sung from an elevated position, and it also produces various trills and rattling sounds which vary in tone and pitch.
Taxonomy
Genus: Agelasticus; Family: Icteridae; Order: Passeriformes.
- Scientific name
- Agelasticus cyanopus
- Authority
- (Vieillot, 1819)
- Order
- Passeriformes
- Family
- Icteridae
- Genus
- Agelasticus
Range and habitat
The unicolored blackbird is native to South America where its range extends from northern Bolivia and southern Brazil to northern Argentina, including much of the lower Amazon region. It is found in marshes, near the edges of ponds and lakes and in adjacent grassland, and its altitudinal range is up to about 600 metres (2,000 ft). It is especially common in the Brazilian Pantanal.
- Migration
- Complete migrants
Behavior
Migration pattern: Complete migrants.
Conservation
Population trend: stable.
- Population trend
- stable
Photos
Distribution
Bird Calls
Other Birds

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