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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: 653024
♂ ♀
  Adult

Turdera
Buenos Aires
Argentina
08/29/2025
Carlos Valpreda
Foto
Photography ID: 653023
♂ ♀
  Adult

Turdera
Buenos Aires
Argentina
08/29/2025
Carlos Valpreda
Foto
Photography ID: 647651
♂ ♀
  Adult

Los Toldos
Salta
Argentina
07/22/2025
Carlos Valpreda
Foto
Photography ID: 647650
♂ ♀
  Adult

Los Toldos
Salta
Argentina
07/22/2025
Carlos Valpreda
Foto
Photography ID: 614473
♂ ♀
  Adult

Valle Grande
Jujuy
Argentina
11/13/2024
Carlos Valpreda
Foto
Photography ID: 506225
♂
  Adult

Puerto Iguazú
Misiones
Argentina
08/20/2022
Carlos Valpreda
Foto
Photography ID: 471715
♂
  Adult

San Francisco
Jujuy
Argentina
11/01/2021
Carlos Valpreda



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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
252775016/08/2026ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)5Carlos Valpreda
245475722/03/2026ArgentinaSanta FeR. P. La Herminia, Dpto 9 de julio3Carlos Valpreda
245445021/03/2026ArgentinaSanta FeRio Saladillo, Humedales, San Javier3Carlos Valpreda
245438821/03/2026ArgentinaSanta FeCamino rural, San Javier4Carlos Valpreda
237277530/09/2025ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur, Reserva Ecológica Costanera Sur (RECS)Carlos Valpreda
236701316/09/2025ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur, Reserva Ecológica Costanera Sur (RECS)9Carlos Valpreda
236697829/08/2025ArgentinaBuenos AiresParque Municipal Finky, Turdera9Carlos Valpreda
234046122/07/2025ArgentinaSaltaLos ToldosCarlos Valpreda
220824414/11/2024ArgentinaJujuyCamino a san francisco, Valle Grande20Carlos Valpreda
220822413/11/2024ArgentinaJujuyBosque de queñoa y aliso entre Santa Ana y Valle Colorado, Valle Grande30Carlos Valpreda
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 30/09/2026.