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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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Records from Argentina

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: 707544
♂
  Adult

La Plata
Buenos Aires
Argentina
09/30/2026
Gabriel Gorrín Armas
Foto
Photography ID: 707290
♂
  Adult

Mendiolaza
Córdoba
Argentina
09/25/2026
Fernanda Ferrari
Foto
Photography ID: 706579
♂
  Adult

Las Bajadas
Córdoba
Argentina
09/20/2026
Daniel Oscar Serra
Foto
Photography ID: 706395
♂
  Adult

La Saladilla
La Rioja
Argentina
09/24/2026
Carlos De Biagi
Foto
Photography ID: 705997
♂
  Adult

La Plata
Buenos Aires
Argentina
09/19/2026
Gabriel Gorrín Armas
Foto
Photography ID: 705803
♂
  Adult

Reserva Natural Urbana Taku
La Rioja
Argentina
09/19/2026
Carlos De Biagi
Foto
Photography ID: 705764
♀
  Adult

San Miguel del Monte
Buenos Aires
Argentina
09/19/2026
Gustavo Pascuas
Foto
Photography ID: 705732
♂
  Adult

Balcarce
Buenos Aires
Argentina
09/19/2026
Edgar Romeo
Foto
Photography ID: 705651
♂
  Adult

Lobos
Buenos Aires
Argentina
09/19/2026
Hernán Tolosa
Foto
Photography ID: 705634
♂
  Adult

Juana Koslay
San Luis
Argentina
09/20/2026
Franco Albano Giuliani



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Species vocalizations

Last vocalizations published


Audio playerUserDateCountryProvincePlaceSexLife stageIt was observedDetails
Manuel Eduardo Serra09/25/2026ArgentinaCórdobaReserva Natural Los Quebrachitos, Cabana, UnquilloN/AAdultNoNo
Sebastián Otero08/08/2021ArgentinaEntre RíosRuta sin nombrar♂AdultYesNo
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

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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
253852130/09/2026ArgentinaBuenos AiresBosque de La Plata, La PlataGabriel Gorrín Armas
253835630/09/202617:36ArgentinaCorrientesRuta Nacional 14Santiago Juan Torres
253834630/09/202616:45ArgentinaMisionesRuta Nacional 14Santiago Juan Torres
253822130/09/202607:37ArgentinaMisionesRuta Nacional 14Walter Liriel Gómez Umpierrez
253821730/09/202607:31ArgentinaMisionesCorrientes 198, Aristóbulo del Valle2Walter Liriel Gómez Umpierrez
253799130/09/202608:05ArgentinaCiudad Autónoma de Buenos AiresAvenida Doctor Tristán Achával Rodríguez 1400, Reserva Ecológica Costanera Sur (RECS)1Gustavo Fernando Durán
253771529/09/202609:54ArgentinaMisionesRuta Nacional 12 16116Walter Liriel Gómez Umpierrez
253739029/09/202609:54ArgentinaMisionesRuta Nacional 12 16116Santiago Juan Torres
253716328/09/2026ArgentinaEntre RíosCeibas6Diego Oscar
253682427/09/2026ArgentinaBuenos AiresLos Carpinchos, Lobería5Susana Gomez
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 02/10/2026.