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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: 246264
♂
  Immature

Puerto Iguazú
Misiones
Argentina
01/23/2018
Andres Espindola
Foto
Photography ID: 234675
♂
  Adult

San Clemente del Tuyú
Buenos Aires
Argentina
12/17/2017
Andres Espindola
Foto
Photography ID: 131675
♂
  Adult

Villa Los Aromos
Córdoba
Argentina
12/29/2015
Andres Espindola
Foto
Photography ID: 122177
  Fledgling

Alta Gracia
Córdoba
Argentina
10/25/2015
Andres Espindola
Foto
Photography ID: 113540
♂
  Adult

Guatraché
La Pampa
Argentina
09/05/2015
Andres Espindola
Foto
Photography ID: 113489
♂
  Adult

Guatraché
La Pampa
Argentina
09/06/2015
Andres Espindola
Foto
Photography ID: 113482
♂ ♀
  Adult

Guatraché
La Pampa
Argentina
09/05/2015
Andres Espindola
Foto
Photography ID: 96475
♂
  Adult

Alta Gracia
Córdoba
Argentina
05/01/2015
Andres Espindola
Foto
Photography ID: 82103
♂
  Adult

Governador Celso Ramos
Santa Catarina
Brazil
01/11/2015
Andres Espindola
Foto
Photography ID: 80502
♀
  Adult

Villa Los Aromos
Córdoba
Argentina
01/03/2015
Andres Espindola
Foto
Photography ID: 74253
♂
  Adult

Marcos Juárez
Córdoba
Argentina
11/25/2014
Andres Espindola
Foto
Photography ID: 50222
♂
  Adult

Alta Gracia
Córdoba
Argentina
03/29/2014
Andres Espindola



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Species vocalizations

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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
201559028/03/2024ArgentinaCórdobaLa ParaAndres Espindola
194910116/01/2024ArgentinaCórdobaVía sin nombreAndres Espindola
194821515/01/2024ArgentinaEntre RíosVía sin nombreAndres Espindola
194353509/01/2024ArgentinaCórdobaParque Provincial Chancaní3Andres Espindola
152399031/12/2021ArgentinaCórdobaVía sin nombreAndres Espindola
151075306/12/2021ArgentinaCórdobaCamino sin nombrarAndres Espindola
150819002/12/2021ArgentinaCórdobaAvenida los Aromos, Villa Los Aromos3Andres Espindola
145142915/08/2021ArgentinaCórdobaDique Chico40Andres Espindola
134158702/01/2021ArgentinaCórdobaVilla del RosarioAndres Espindola
129867711/10/2020ArgentinaCórdobaVilla Los Aromos10Andres Espindola
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 01/10/2026.