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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: 572612
  Immature

Azul
Buenos Aires
Argentina
01/27/2024
Victoria Herrera
Foto
Photography ID: 270074
♂
  Adult

Puerto Iguazú
Misiones
Argentina
06/05/2018
Victoria Herrera
Foto
Photography ID: 226256
♂
  Adult

Salta (Capital)
Salta
Argentina
10/25/2017
Victoria Herrera
Foto
Photography ID: 223780
♂
  Adult

Chillar
Buenos Aires
Argentina
10/17/2017
Victoria Herrera
Foto
Photography ID: 223778
♀
  Adult

Chillar
Buenos Aires
Argentina
10/17/2017
Victoria Herrera
Foto
Photography ID: 223529
♂
  Adult

Federación
Entre Ríos
Argentina
09/24/2017
Victoria Herrera
Foto
Photography ID: 170152
♂
  Adult

Chillar
Buenos Aires
Argentina
10/08/2016
Victoria Herrera
Foto
Photography ID: 137206
♂
  Adult

Villa de Merlo
San Luis
Argentina
01/30/2016
Victoria Herrera
Foto
Photography ID: 137127
  Juvenile

Villa Mercedes
San Luis
Argentina
01/26/2016
Victoria Herrera
Foto
Photography ID: 126602
♂ ♀
 
Chillar
Buenos Aires
Argentina
11/11/2015
Victoria Herrera
Foto
Photography ID: 126391
♂
  Adult

Benito Juárez
Buenos Aires
Argentina
11/22/2015
Victoria Herrera
Foto
Photography ID: 124953
♂
  Adult

Monte Hermoso
Buenos Aires
Argentina
10/10/2015
Victoria Herrera



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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
245806723/03/2026ArgentinaBuenos AiresSalidas En Las Chacras De Azul, Azul2Victoria Herrera
220248430/11/2024ArgentinaBuenos AiresChacras, Azul2Victoria Herrera
216527505/10/2024ArgentinaBuenos AiresChacras, Azul4Victoria Herrera
197840327/01/2024ArgentinaBuenos AiresChacras, Azul4Victoria Herrera
197835713/01/2024ArgentinaBuenos AiresAzul3Victoria Herrera
176414813/05/2023ArgentinaBuenos AiresChillar35Victoria Herrera
176688806/05/2023ArgentinaBuenos AiresRío Quequén Grande Lobería, Lobería5Victoria Herrera
171043321/01/2023ArgentinaBuenos AiresChillar3Victoria Herrera
168047525/11/2022ArgentinaBuenos AiresCamping Municipal La Chacra, CarhuéVictoria Herrera
168043223/11/2022ArgentinaBuenos AiresPlaza Tte. Gral. Levalle, CarhuéVictoria Herrera
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.