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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: 690928
♂ ♀
  Adult

Magdalena
Buenos Aires
Argentina
05/21/2026
Elsa Longo
Foto
Photography ID: 670029
♂ ♀
  Adult

Ceibas
Entre Ríos
Argentina
01/12/2026
Elsa Longo
Foto
Photography ID: 552365
♂
  Adult

Tafí del Valle
Tucumán
Argentina
08/25/2023
Elsa Longo
Foto
Photography ID: 489280
♀
  Adult

Malargüe
Mendoza
Argentina
12/13/2021
Elsa Longo
Foto
Photography ID: 383306
♂
  Adult

Reserva Provincial Parque Luro
La Pampa
Argentina
01/15/2020
Elsa Longo
Foto
Photography ID: 308617
♀
  Adult

Reserva Privada Punta del Agua
San Luis
Argentina
11/14/2018
Elsa Longo
Foto
Photography ID: 307893
♂
  Adult

Parque Nacional Iberá
Corrientes
Argentina
10/29/2018
Elsa Longo



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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
248157921/05/2026ArgentinaBuenos AiresCalle rural a Alvarez Jonte, MagdalenaElsa Longo
247057614/05/2026ArgentinaEntre RíosCeibas8Elsa Longo
247333918/04/2026ArgentinaBuenos AiresParque Natural Municipal Ribera Norte (San Isidro)Elsa Longo
244823411/02/2026ArgentinaLa PampaReserva Provincial Parque LuroElsa Longo
242371312/01/2026ArgentinaEntre RíosCeibasElsa Longo
241699204/01/2026ArgentinaCiudad Autónoma de Buenos AiresLago de Regatas6Elsa Longo
240076224/11/2025ArgentinaEntre RíosCamino a 4 Hermanas, Ceibas6Elsa Longo
236146309/08/2025ArgentinaBuenos AiresNecochea10Elsa Longo
232211401/06/2025ArgentinaSanta FeLaguna El Hinojo, Venado TuertoElsa Longo
228654802/04/2025ArgentinaEntre RíosCeibasElsa Longo
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.