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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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Latest feeding records





Species photographs

Count: 3418

Foto
Photography ID: 705112
  Adult

La Plata
Buenos Aires
Argentina
09/16/2026
Gabriel Gorrín Armas
Foto
Photography ID: 705105
  Adult

La Plata
Buenos Aires
Argentina
09/16/2026
Gabriel Gorrín Armas
Foto
Photography ID: 705104
  Adult

La Plata
Buenos Aires
Argentina
09/16/2026
Gabriel Gorrín Armas
Foto
Photography ID: 705001
  Adult

Dique de Los Sauces
La Rioja
Argentina
09/15/2026
Carlos De Biagi
Foto
Photography ID: 705000
  Adult

Dique de Los Sauces
La Rioja
Argentina
09/15/2026
Carlos De Biagi
Foto
Photography ID: 704907
  Adult

Purmamarca
Jujuy
Argentina
09/21/2024
Diego Alfonso Rosa
Foto
Photography ID: 704810
  Adult

La Plata
Buenos Aires
Argentina
09/14/2026
Gabriel Gorrín Armas
Foto
Photography ID: 704618
  Adult

Gualeguaychú
Entre Ríos
Argentina
07/26/2026
Andrea Casaburi
Foto
Photography ID: 704612
  Adult

Gualeguaychú
Entre Ríos
Argentina
07/26/2026
Andrea Casaburi
Foto
Photography ID: 704611
  Adult

Gualeguaychú
Entre Ríos
Argentina
07/26/2026
Andrea Casaburi
Foto
Photography ID: 704416
  Adult

Yerba Buena
Tucumán
Argentina
08/28/2026
Tiziano Luka Pesci Rubilar



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Species vocalizations

Count: 6


Audio playerUserDateCountryProvincePlaceSexLife stageIt was observedDetails
Eduardo Jorge Cavalcante Vieira03/26/2025BrazilAlagoasAabb MaceióMaceioAdultYesNo
Sebastián Otero08/08/2021ArgentinaEntre RíosRuta sin nombrarAdultYesNo
Santiago Sainz-trápaga11/09/2013ArgentinaChubutValle Inferior del Río Chubut (VIRCH)AdultYesNo
Jose Luis Merlo05/09/2009ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)AdultYesNo
Jose Luis Merlo08/14/2009ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)AdultNoNo
Jose Luis Merlo08/14/2009ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)AdultNoNo


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Species videos

Count: 13





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Species reports



 Detail of places sorted by number of records






Species records

Count: 18895



Page 1 of 1890
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
252989920/09/202616:59ArgentinaSanta FeAvenida Belgrano 996, San Jerónimo Norte4Gustavo Fernando Durán
252974320/09/202612:00ArgentinaBuenos Aires9 de Julio 78, Ramos Mejía2Eduardo Cusano
252939519/09/202612:36ArgentinaEntre RíosRuta Nacional 126María Alejandra Sosa
252914619/09/202612:36ArgentinaEntre RíosRuta Nacional 126Jorge La Grotteria
252907719/09/202608:04ArgentinaSanta Fe1º de Mayo 2401, Santa Fe de la Vera Cruz2Gustavo Fernando Durán
252863116/09/2026ArgentinaBuenos Aires-34.62391,-58.364451Pablo Richter
252831616/09/2026ArgentinaBuenos AiresBosque de La Plata, La PlataGabriel Gorrín Armas
252830816/09/2026ArgentinaBuenos AiresBosque de La Plata, La PlataGabriel Gorrín Armas
252830716/09/2026ArgentinaBuenos AiresBosque de La Plata, La PlataGabriel Gorrín Armas
252806816/09/202615:57ArgentinaSanta FeRuta Nacional 168 80, Santa Fe de la Vera Cruz2Gustavo Fernando Durán
Page 1 of 1890

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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 20/09/2026.