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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: 678204
♀
  Adult

Resistencia
Chaco
Argentina
02/01/2026
Fernando Naifleisch
Foto
Photography ID: 654046
♂
  Adult

Curacautín
Región de la Araucanía
Chile
02/20/2025
Fernando Naifleisch
Foto
Photography ID: 565366
  Juvenile

Valle de uco
Mendoza
Argentina
12/25/2023
Fernando Naifleisch
Foto
Photography ID: 416186
  Fledgling

Bahía Blanca
Buenos Aires
Argentina
02/11/2018
Fernando Naifleisch
Foto
Photography ID: 361447
♀
  Adult

Esteros del Iberá
Corrientes
Argentina
11/14/2018
Fernando Naifleisch
Foto
Photography ID: 344113
♂
  Adult

Vicente López
Buenos Aires
Argentina
11/09/2018
Fernando Naifleisch
Foto
Photography ID: 341487
♂ ♀
  Adult

Chaco Paraguayo
Boquerón
Paraguay
12/20/2017
Fernando Naifleisch



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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
244821001/02/2026ArgentinaChacoParque de la Democracia, ResistenciaFernando Naifleisch
236863520/02/2025ChileRegión de la AraucaníaLo de Palma, CuracautínFernando Naifleisch
194881325/12/2023ArgentinaMendozaChorro de la vieja, Valle de ucoFernando Naifleisch
112953014/11/2018ArgentinaCorrientesEsteros del IberáFernando Naifleisch
95478809/11/2018ArgentinaBuenos AiresCostanera martinez, Vicente LópezFernando Naifleisch
130352411/02/2018ArgentinaBuenos AiresBahía BlancaFernando Naifleisch
94798920/12/2017ParaguayBoquerónChaco ParaguayoFernando Naifleisch
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.