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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: 610436
♂ ♀
  Adult

El Rodeo, Ambato
Catamarca
Argentina
01/21/2024
Fabrizio García
Foto
Photography ID: 607990
♂ ♀
  Adult

Capital
Córdoba
Argentina
11/05/2024
Fabrizio García
Foto
Photography ID: 434643
♂
  Adult

El Rodeo, Ambato
Catamarca
Argentina
01/01/2021
Fabrizio García
Foto
Photography ID: 425903
♂
  Adult

El Rodeo, Ambato
Catamarca
Argentina
01/23/2020
Fabrizio García
Foto
Photography ID: 36661
♀
  Adult

El Rodeo, Ambato
Catamarca
Argentina
01/08/2014
Fabrizio García
Foto
Photography ID: 36348
♂
  Adult

Córdoba
Córdoba
Argentina
01/01/2014
Fabrizio García



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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
237347430/07/2025ArgentinaCiudad Autónoma de Buenos AiresPlaza de las Naciones Unidas5Fabrizio García
222937530/12/2024ArgentinaCatamarcaTúneles de La Merced, La MercedFabrizio García
222934429/12/2024ArgentinaCatamarcaLas HiguerillasFabrizio García
222931028/12/2024ArgentinaCatamarcaDique Sumampa, La ViñaFabrizio García
221937828/12/2024ArgentinaCatamarcaRuta Provincial 9Fabrizio García
220648808/12/2024ArgentinaCórdobaRuta Nacional 192Fabrizio García
219611119/11/2024ArgentinaCórdobaRuta Nacional 9, Las Peñas15Fabrizio García
219582919/11/2024ArgentinaSantiago del EsteroRuta Nacional 9 1174Fabrizio García
219558517/11/2024ArgentinaSantiago del EsteroTermas de Río HondoFabrizio García
218401905/11/2024ArgentinaCórdobaCórdoba--Parque Sarmiento, CapitalFabrizio García
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 30/09/2026.