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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: 119613
♀
  Adult

Guatraché
La Pampa
Argentina
10/12/2015
Federico Burgos Bauer
Foto
Photography ID: 85640
  Juvenile

Guatraché
La Pampa
Argentina
02/19/2015
Federico Burgos Bauer
Foto
Photography ID: 79446
♂
  Adult

Guatraché
La Pampa
Argentina
01/28/2015
Federico Burgos Bauer
Foto
Photography ID: 79409
♀
  Adult

Guatraché
La Pampa
Argentina
01/28/2015
Federico Burgos Bauer
Foto
Photography ID: 79405
  Fledgling

Guatraché
La Pampa
Argentina
01/28/2015
Federico Burgos Bauer
Foto
Photography ID: 78960
♀
  Adult

Guatraché
La Pampa
Argentina
01/24/2015
Federico Burgos Bauer
Foto
Photography ID: 77921
♀
  Adult

Guatraché
La Pampa
Argentina
01/15/2015
Federico Burgos Bauer
Foto
Photography ID: 76638
♂
  Adult

Guatraché
La Pampa
Argentina
01/10/2015
Federico Burgos Bauer
Foto
Photography ID: 73089
♂
  Adult

Toay
La Pampa
Argentina
12/21/2014
Federico Burgos Bauer
Foto
Photography ID: 72848
♀
  Adult

Toay
La Pampa
Argentina
12/21/2014
Federico Burgos Bauer
Foto
Photography ID: 70350
♂
  Adult

Santa Rosa
La Pampa
Argentina
08/09/2014
Federico Burgos Bauer



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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
34653612/10/2015ArgentinaLa PampaReserva Natural Laguna Guatraché, GuatrachéFederico Burgos Bauer
24970519/02/2015ArgentinaLa PampaAlrededores del pueblo, GuatrachéFederico Burgos Bauer
23227928/01/2015ArgentinaLa PampaLaguna Guatraché, GuatrachéFederico Burgos Bauer
23117224/01/2015ArgentinaLa PampaAlrededores del pueblo, GuatrachéFederico Burgos Bauer
22862515/01/2015ArgentinaLa PampaLaguna Guatraché, GuatrachéFederico Burgos Bauer
22481010/01/2015ArgentinaLa PampaPredio Agrotécnica, GuatrachéFederico Burgos Bauer
21163021/12/2014ArgentinaLa PampaJardín Botánico Provincial, ToayFederico Burgos Bauer
18451704/10/2014ArgentinaLa PampaSendero al Médano del zorro, Reserva Provincial Parque LuroFederico Burgos Bauer
20417209/08/2014ArgentinaLa PampaAlrededores de la Ciudad, Santa RosaFederico Burgos Bauer
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.