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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: 701794
♂
  Adult

Alrededores de San Carlos
Salta
Argentina
01/09/2026
José Luis Ianiro
Foto
Photography ID: 701716
♂
  Adult

Capital
Salta
Argentina
01/02/2026
José Luis Ianiro
Foto
Photography ID: 701593
♀
  Adult

Salta
Salta
Argentina
12/31/2025
José Luis Ianiro
Foto
Photography ID: 694943
♂
  Adult

Mar del Plata
Buenos Aires
Argentina
10/17/2025
José Luis Ianiro
Foto
Photography ID: 694390
♂
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/11/2025
José Luis Ianiro
Foto
Photography ID: 694268
♂
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/04/2025
José Luis Ianiro
Foto
Photography ID: 694127
♂
  Adult

General Pueyrredón
Buenos Aires
Argentina
08/17/2025
José Luis Ianiro
Foto
Photography ID: 646183
♂
  Adult

Mar del Plata
Buenos Aires
Argentina
06/07/2025
José Luis Ianiro
Foto
Photography ID: 645380
♂
  Adult

Mar de Cobo
Buenos Aires
Argentina
05/02/2025
José Luis Ianiro
Foto
Photography ID: 626297
♀
  Fledgling

Viña del Mar
Región de Valparaíso
Chile
01/13/2025
José Luis Ianiro
Foto
Photography ID: 624618
♀
  Adult

Mar del Plata
Buenos Aires
Argentina
11/30/2024
José Luis Ianiro



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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
251675409/01/2026ArgentinaSaltaAlrededores de San CarlosJosé Luis Ianiro
251666702/01/2026ArgentinaSaltaParque Los Lapachos, CapitalJosé Luis Ianiro
251646931/12/2025ArgentinaSaltaCerro San Bernardo, SaltaJosé Luis Ianiro
249397317/10/2025ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata, Mar del PlataJosé Luis Ianiro
249268011/10/2025ArgentinaBuenos AiresCamino ingreso a la Albúfera Laguna Mar Chiquita, Mar ChiquitaJosé Luis Ianiro
249260611/10/2025ArgentinaBuenos AiresReserva Natural Privada Paititi, Partido de General PueyrredónJosé Luis Ianiro
249249304/10/2025ArgentinaBuenos AiresCamino ingreso a la Albúfera Laguna Mar Chiquita, Mar ChiquitaJosé Luis Ianiro
249214517/08/2025ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata, General PueyrredónJosé Luis Ianiro
249162006/07/2025ArgentinaBuenos AiresLagunas de Punta Mogotes, Mar del Plata8José Luis Ianiro
233197107/06/2025ArgentinaBuenos AiresReserva Natural Paititi, Mar del PlataJosé Luis Ianiro
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.