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Species icon
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




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Latest feeding records




Number of Photography: 3278

Foto
Photography ID: 677808
  Adult

Henderson
Buenos Aires
Argentina
03/16/2026
Juan Manuel Canepa
Foto
Photography ID: 677451
  Adult

Cercania de General Pico
La Pampa
Argentina
03/10/2026
Graciela Antenucci
Foto
Photography ID: 677409
  Adult

Maceio
Alagoas
Brazil
03/12/2026
Eduardo Jorge Cavalcante Vieira
Foto
Photography ID: 677275
  Adult

Cebollar
La Rioja
Argentina
03/05/2026
Carlos De Biagi
Foto
Photography ID: 676306
  Immature

Arocena
Santa Fe
Argentina
03/01/2026
Gaston Lisandro Gabinetti
Foto
Photography ID: 676205
  Immature

Arocena
Santa Fe
Argentina
03/01/2026
Peter Vidana
Foto
Photography ID: 675051
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
01/10/2026
Andrea Casaburi
Foto
Photography ID: 674924
  Immature

Punta Indio
Buenos Aires
Argentina
02/16/2026
Peter Vidana
Foto
Photography ID: 674205
  Adult

Tanti
Córdoba
Argentina
01/25/2026
Damián Carnevale
Foto
Photography ID: 673892
 
San Rafael
Mendoza
Argentina
02/13/2026
Fernanda Ferrari
Foto
Photography ID: 673287
  Adult

Reserva Natural Urbana Taku
La Rioja
Argentina
02/14/2026
Carlos De Biagi
Foto
Photography ID: 673106
  Adult

San Fernando
Buenos Aires
Argentina
11/27/2025
Catalina Marcovecchio



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Number of Recorded Vocalizations: 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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Number of Films: 13





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 Reports


 Detail of places sorted by number of records






Number of Records: 18389



Page 1 of 1839
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
244742816/03/2026ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
244568912/03/2026BrazilAlagoasAabb Maceió, MaceioEduardo Jorge Cavalcante Vieira
244574410/03/2026ArgentinaLa PampaReserva Natural Urbana Delfín Pérez, Cercania de General PicoGraciela Antenucci
244547710/03/2026ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)Nicolas Olejnik
244673408/03/2026ArgentinaEntre RíosRuta 174, Victoria8Pablo Bruni
244660208/03/2026ArgentinaSanta FeCamino Puerto Ocampo6Gabriel Carbajales
244506008/03/202617:57ArgentinaCiudad Autónoma de Buenos AiresCalle Andres Bello, Lago de RegatasGuillermo Marcaida
244644307/03/2026ArgentinaSanta FePredio cabañas la Joyita, Jaaukanigás3Gabriel Carbajales
244310007/03/202608:05ArgentinaSanta FeAvenida Juan José Paso 2921, Santa Fe de la Vera Cruz1Gustavo Fernando Durán
244630706/03/2026ArgentinaSanta FeRuta prov. 1, San Javier8Gabriel Carbajales
Page 1 of 1839

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 17/03/2026.