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Unicoloured blackbird
The unicoloured blackbird (''Agelasticus cyanopus'') is a species of bird in the family Icteridae.〔BirdLife International 2012. (Unicolored Blackbird (Chrysomus cyanopus) ).〕 Found in Argentina, Bolivia, Brazil, and Paraguay, its natural habitat is swamps and nearby grassland. It is a fairly common bird and the International Union for Conservation of Nature has rated it a "least-concern species".
==Description==
The male unicoloured 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 irids 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,〔Jaramillo, Alvaro. 2010. Unicolored Blackbird (Agelasticus cyanopus), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online: http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=671436〕 and it also produces various trills and rattling sounds which vary in tone and pitch.
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