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Shiny Cowbird

Molothrus bonariensis
(Gmelin, JF, 1789)
Tordo Renegrido
Chupim

Family: Icteridae
Order: Passeriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Records from Alto Paraná

Conservation status according to BirdLife International: Least Concern

Description: It is a medium-sized bird with a robust build and upright posture, showing clear sexual dimorphism. The male displays glossy black plumage with bluish or purplish iridescence, while the female is much duller, with brownish to grayish tones and fine streaking. The bill is short, strong, and conical, suited to a varied diet, and the dark eyes give it an alert expression.

Geographic distribution: It is widely distributed throughout South America, with natural and human-facilitated expansion into Central America and parts of the Caribbean. It is one of the most widespread species within its genus.

Habitat: It primarily inhabits open and semi-open environments, such as grasslands, farmland, rural areas, city outskirts, and urban parks. Its high tolerance for human-altered landscapes has greatly contributed to its geographic expansion.

Feeding: This species is omnivorous, feeding mainly on seeds, grains, and small invertebrates such as insects and larvae. It often forages on the ground, alone or in groups, frequently taking advantage of resources associated with livestock and agriculture.

Behavior: It is a gregarious and opportunistic species, commonly seen in flocks, especially outside the breeding season. It shows confident and adaptable behavior, often frequenting areas with intense human activity. During reproduction, females exhibit particularly stealthy behavior.

Nesting: It has a distinctive reproductive strategy known as brood parasitism, as it does not build its own nest. Females lay their eggs in the nests of other bird species, which then incubate the eggs and raise the chicks. The young often grow rapidly and may outcompete or displace the host’s offspring.

Conservation status: It is classified as Least Concern, due to its wide distribution, large population size, and strong adaptability. No significant global threats are currently identified.


Author of this compilation: EcoRegistros – 22/12/2025




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Last published photographs

Foto
Photography ID: 203518
  Adult

Prete. Franco
Alto Paraná
Paraguay
05/09/2017
Jorge Sarubbi Künzle
Foto
Photography ID: 176272
♂ ♀
  Adult

Presidente Franco
Alto Paraná
Paraguay
03/06/2016
Jorge Sarubbi Künzle
Foto
Photography ID: 111672
  Adult

Hernandarias
Alto Paraná
Paraguay
08/26/2015
Jorge Sarubbi Künzle



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 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
239778804/12/2025ParaguayAlto ParanáPuerto Balsa, Presidente Franco1Diego Oscar
222495907/12/2023ParaguayAlto ParanáReserva Itabó6Dominic Oviedo Löwen
222496426/08/2023ParaguayAlto Paraná Zona Estancia Itavo4Dominic Oviedo Löwen
134972615/01/2021ParaguayAlto ParanáCampo-pradera, HernandariasJorge Sarubbi Künzle
111210214/10/2019ParaguayAlto ParanáCiudad del Este2Diego Oscar
57681909/05/2017ParaguayAlto ParanáCasa en ciudad, Prete. FrancoJorge Sarubbi Künzle
50487606/03/2016ParaguayAlto ParanáArboledas en Ciudad, Presidente FrancoJorge Sarubbi Künzle
32092126/08/2015ParaguayAlto ParanáHernandariasJorge Sarubbi Künzle
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 10/04/2026.