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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 Ceibas

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: 670029
♂ ♀
  Adult

Ceibas
Entre Ríos
Argentina
01/12/2026
Elsa Longo
Foto
Photography ID: 657800
  Adult

Ceibas
Entre Ríos
Argentina
09/20/2025
Carlos De Biagi
Foto
Photography ID: 657580
  Adult

Ceibas
Entre Ríos
Argentina
09/19/2025
Carlos De Biagi
Foto
Photography ID: 657579
  Adult

Ceibas
Entre Ríos
Argentina
09/19/2025
Carlos De Biagi
Foto
Photography ID: 632649
  Immature

Ceibas
Entre Ríos
Argentina
04/12/2025
Pablo Richter
Foto
Photography ID: 533665
 
Ceibas
Entre Ríos
Argentina
04/30/2023
Angel Siguen
Foto
Photography ID: 506805
  Adult

Ceibas
Entre Ríos
Argentina
09/03/2022
Daniel Osvaldo Fernández
Foto
Photography ID: 475494
  Adult

Ceibas
Entre Ríos
Argentina
09/18/2021
Daniel Osvaldo Fernández
Foto
Photography ID: 465750
 

Ceibas
Entre Ríos
Argentina
10/09/2021
Matias Petroccello
Foto
Photography ID: 457848
 
Ceibas
Entre Ríos
Argentina
08/14/2021
Daniel Osvaldo Fernández
Foto
Photography ID: 370374
  Adult

Ceibas
Entre Ríos
Argentina
08/18/2019
Guillermo C Olivero
Foto
Photography ID: 370373
  Adult

Ceibas
Entre Ríos
Argentina
08/18/2019
Guillermo C Olivero



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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
243439916/02/202617:42ArgentinaEntre RíosCeibas8Jorge La Grotteria
243433716/02/202617:42ArgentinaEntre RíosCeibas8María Alejandra Sosa
242408717/01/2026ArgentinaEntre RíosCeibasWalter Liriel Gómez Umpierrez
241788717/01/2026ArgentinaEntre RíosCeibas8Diego Oscar
242371312/01/2026ArgentinaEntre RíosCeibasElsa Longo
241201407/01/2026ArgentinaEntre RíosCeibas2Diego Oscar
241461805/01/2026ArgentinaEntre RíosCeibas2Gabriel Carbajales
241448804/01/2026ArgentinaEntre RíosEa. Campo Bajo, Ceibas3Gabriel Carbajales
241439404/01/2026ArgentinaEntre RíosTerraplen, Ceibas6Gabriel Carbajales
241074504/01/2026ArgentinaEntre RíosCeibasNicolas Olejnik
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.