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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 Esteros del Iberá

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: 498536
♂ ♀
  Adult

Esteros del Iberá
Corrientes
Argentina
10/27/2021
Patricia Gabriela Mancilla Iglesias
Foto
Photography ID: 361447
  Adult

Esteros del Iberá
Corrientes
Argentina
11/14/2018
Fernando Naifleisch
Foto
Photography ID: 304169
  Adult

Esteros del Iberá
Corrientes
Argentina
11/25/2018
Guillermo C Olivero
Foto
Photography ID: 304167
  Adult

Esteros del Iberá
Corrientes
Argentina
11/25/2018
Guillermo C Olivero
Foto
Photography ID: 290115
  Adult

Esteros del Iberá
Corrientes
Argentina
09/11/2018
Sebastián Otero
Foto
Photography ID: 2286
  Adult

Esteros del Iberá
Corrientes
Argentina
10/10/2010
Rosana Ursino



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
237443528/09/2025ArgentinaCorrientesColonia Pellegrini, Esteros del Iberá2Francisco Encinosa
236991728/09/2025ArgentinaCorrientesColonia Pellegrini, Esteros del Iberá2Susana Gomez
214634008/09/2024ArgentinaCorrientesCamba Trapo, Esteros del Iberá4Diego Oscar
214620508/09/2024ArgentinaCorrientesNavegación Rio Miriñay, Esteros del Iberá8Diego Oscar
214596707/09/2024ArgentinaCorrientesNavegacion Rio Corrientes, Esteros del Iberá4Diego Oscar
201853517/03/2024ArgentinaCorrientesNavegacion Rio Corrientes, Esteros del Iberá4Diego Oscar
189181001/10/2023ArgentinaCorrientesNavegacion Laguna Ibera, Esteros del Iberá2Diego Oscar
189176730/09/2023ArgentinaCorrientesNavegacion Rio Corrientes, Esteros del Iberá2Diego Oscar
173826521/03/2023ArgentinaCorrientesNavegación Rio Miriñay, Esteros del Iberá3Diego Oscar
166197320/10/2022ArgentinaCorrientesNavegacion Rio Corrientes, Esteros del Iberá3Maria Victoria Di Stasio
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 19/04/2026.