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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: 3325

Foto
Photography ID: 686999
  Adult

Ruta 20
San Luis
Argentina
04/07/2026
Hugo Alberto Valderrey
Foto
Photography ID: 686200
  Adult

Dique El Saladillo
La Rioja
Argentina
04/22/2026
Carlos De Biagi
Foto
Photography ID: 685912
  Adult

General Pico
La Pampa
Argentina
05/09/2026
Margarita Cervio
Foto
Photography ID: 685884
  Adult

General Pico
La Pampa
Argentina
05/09/2026
Margarita Cervio
Foto
Photography ID: 685515
  Adult

Tabay
Corrientes
Argentina
04/19/2026
Peter Vidana
Foto
Photography ID: 685426
♂ ♀
  Adult

Tabay
Corrientes
Argentina
04/19/2026
Gaston Lisandro Gabinetti
Foto
Photography ID: 685159
♂ ♀
  Adult

Guayquiraró
Corrientes
Argentina
04/19/2026
Gaston Lisandro Gabinetti
Foto
Photography ID: 685129
♂ ♀
  Adult

Esquina
Corrientes
Argentina
04/19/2026
Peter Vidana
Foto
Photography ID: 685126
  Adult

Esquina
Corrientes
Argentina
04/19/2026
Peter Vidana
Foto
Photography ID: 684994
  Adult

Santurce, San Cristóbal
Santa Fe
Argentina
04/19/2026
Carlos De Biagi
Foto
Photography ID: 684655
♂ ♀
  Adult

Suba
Bogotá
Colombia
05/02/2026
Jairo Alberto García Giraldo
Foto
Photography ID: 684638
  Adult

Balneario la Verde
Santa Fe
Argentina
04/18/2026
Carlos De Biagi



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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: 18515



Page 1 of 1852
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
247057614/05/2026ArgentinaEntre RíosCeibas8Elsa Longo
247048214/05/2026ArgentinaEntre RíosCeibas8Guillermo Marcaida
247016313/05/2026ArgentinaBuenos AiresCamino rural Vieytes, Magdalena6Gabriel Carbajales
247003510/05/2026ArgentinaCórdobaCamino rural al Se de Alicia, AliciaHugo Caverzasi
246922109/05/2026ArgentinaEntre RíosCeibasWalter Liriel Gómez Umpierrez
246845109/05/2026ArgentinaLa PampaPatio de mi casa, General PicoMargarita Cervio
246842209/05/2026ArgentinaLa PampaReserva Natural Urbana Delfín Perez de General Pico., General PicoMargarita Cervio
246833909/05/202614:31ArgentinaCorrientesCamino del Camba Trapo3Aluminé Sangorrín
246643803/05/2026ArgentinaCorrientesRuta 14, Monte Caseros25Gabriel Carbajales
246640603/05/2026ArgentinaCorrientesYellow Cardinal Lodge, Curuzú Cuatiá1Gabriel Carbajales
Page 1 of 1852

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 18/05/2026.