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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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Records from Guatraché

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




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Last published photographs

Foto
Photography ID: 319359
 
Guatraché
La Pampa
Argentina
10/06/2018
Gonzalo Camiletti
Foto
Photography ID: 171168
  Adult

Guatraché
La Pampa
Argentina
10/12/2016
Lucas Nikolaus
Foto
Photography ID: 120755
  Adult

Guatraché
La Pampa
Argentina
10/11/2015
Manuela Juliana Vargas
Foto
Photography ID: 120737
♂ ♀
  Adult

Guatraché
La Pampa
Argentina
10/11/2015
Manuela Juliana Vargas
Foto
Photography ID: 119613
  Adult

Guatraché
La Pampa
Argentina
10/12/2015
Federico Burgos Bauer
Foto
Photography ID: 114974
  Adult

Guatraché
La Pampa
Argentina
09/19/2015
Manuela Juliana Vargas
Foto
Photography ID: 113540
  Adult

Guatraché
La Pampa
Argentina
09/05/2015
Andres Espindola
Foto
Photography ID: 113489
  Adult

Guatraché
La Pampa
Argentina
09/06/2015
Andres Espindola
Foto
Photography ID: 113482
♂ ♀
  Adult

Guatraché
La Pampa
Argentina
09/05/2015
Andres Espindola
Foto
Photography ID: 113473
♂ ♀
 
Guatraché
La Pampa
Argentina
09/05/2015
Marcelo Fabio Dolsan
Foto
Photography ID: 113328
  Adult

Guatraché
La Pampa
Argentina
09/05/2015
Diego Hernán Pérez
Foto
Photography ID: 113216
 
Guatraché
La Pampa
Argentina
09/05/2015
Lucas Nikolaus



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 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
169778202/01/2023ArgentinaLa PampaCercanías a Cnia Menonita, GuatrachéSusana Gomez
124840524/02/2020ArgentinaLa PampaReserva Natural Laguna Guatraché, Guatraché5Fernando Alberto Segura
85817106/10/2018ArgentinaLa PampaReserva Natural Laguna Guatraché, Guatraché1Gonzalo Camiletti
54650709/02/2017ArgentinaLa PampaLaguna de Guatraché, GuatrachéFernando Alberto Segura
49096912/10/2016ArgentinaLa PampaGuatraché, GuatrachéLucas Nikolaus
42066024/03/2016ArgentinaLa PampaGuatrachéVictoria Herrera
34653612/10/2015ArgentinaLa PampaReserva Natural Laguna Guatraché, GuatrachéFederico Burgos Bauer
34964011/10/2015ArgentinaLa PampaCaminos vecinales, GuatrachéManuela Juliana Vargas
33025619/09/2015ArgentinaLa PampaReserva Natural Laguna Guatraché, GuatrachéManuela Juliana Vargas
32644906/09/2015ArgentinaLa PampaReserva Natural Laguna Guatraché, GuatrachéAndres Espindola
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 05/04/2026.