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Molothrus bonariensis

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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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





Geographic distribution


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Species photographs

Last published photographs

Foto
Photography ID: 695935
♀
  Adult

Salento
Quindío
Colombia
03/02/2026
Federico J. Villegas
Foto
Photography ID: 665428
♀
  Adult

Cruz del Eje
Córdoba
Argentina
12/27/2025
Federico J. Villegas
Foto
Photography ID: 579674
♂
  Adult

Sinsacate
Córdoba
Argentina
01/20/2024
Federico J. Villegas
Foto
Photography ID: 483345
♂
  Adult

Villa del Totoral
Córdoba
Argentina
01/17/2022
Federico J. Villegas
Foto
Photography ID: 453880
♀
  Adult

San Javier
Córdoba
Argentina
07/10/2021
Federico J. Villegas
Foto
Photography ID: 409264
♂
  Adult

Córdoba
Córdoba
Argentina
08/23/2020
Federico J. Villegas
Foto
Photography ID: 225063
♂
  Adult

Sinsacate
Córdoba
Argentina
10/21/2017
Federico J. Villegas
Foto
Photography ID: 180863
♂
  Adult

Santo Tomé
Corrientes
Argentina
01/16/2016
Federico J. Villegas
Foto
Photography ID: 38645
♂
  Adult

Sinsacate
Córdoba
Argentina
01/05/2014
Federico J. Villegas



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Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
249861302/03/2026ColombiaQuindíoSalentoFederico J. Villegas
240743027/12/2025ArgentinaCórdobaDesembocadura del Río Quilpo, Cruz del EjeFederico J. Villegas
202193820/01/2024ArgentinaCórdobaSinsacateFederico J. Villegas
193554723/12/2023ArgentinaCórdobaCañada Larga - Las ManzanasFederico J. Villegas
154983217/01/2022ArgentinaCórdobaVilla del TotoralFederico J. Villegas
142825810/07/2021ArgentinaCórdobaSan JavierFederico J. Villegas
128237423/08/2020ArgentinaCórdobareserva municipal Parque general San Martín, CórdobaFederico J. Villegas
86955913/10/2018ArgentinaCórdobaParque Nacional Quebrada del CondoritoFederico J. Villegas
63350521/10/2017ArgentinaCórdobaSinsacateFederico J. Villegas
51606916/01/2016ArgentinaCorrientesSanto ToméFederico J. Villegas
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) – Species account. Accessed from www.ecoregistros.org on 01/10/2026.