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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 Mar de Ajó

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: 569150
  Adult

Mar de Ajó
Buenos Aires
Argentina
12/28/2023
Diego Trillo
Foto
Photography ID: 569149
  Adult

Mar de Ajó
Buenos Aires
Argentina
12/28/2023
Diego Trillo
Foto
Photography ID: 569148
  Adult

Mar de Ajó
Buenos Aires
Argentina
12/28/2023
Diego Trillo
Foto
Photography ID: 480047
  Adult

Mar de Ajó
Buenos Aires
Argentina
12/30/2021
Diego Trillo
Foto
Photography ID: 480046
  Adult

Mar de Ajó
Buenos Aires
Argentina
12/30/2021
Diego Trillo
Foto
Photography ID: 381346
  Adult

Mar de Ajó
Buenos Aires
Argentina
01/28/2020
Diego Trillo
Foto
Photography ID: 372694
 

Mar de Ajó
Buenos Aires
Argentina
01/03/2020
Fernando Iglesias
Foto
Photography ID: 316793
  Adult

Mar de Ajó
Buenos Aires
Argentina
01/31/2019
Diego Trillo
Foto
Photography ID: 316786
  Adult

Mar de Ajó
Buenos Aires
Argentina
01/30/2019
Diego Trillo
Foto
Photography ID: 316729
  Adult

Mar de Ajó
Buenos Aires
Argentina
01/22/2019
Diego Trillo
Foto
Photography ID: 316497
  Adult

Mar de Ajó
Buenos Aires
Argentina
01/30/2019
Diego Trillo
Foto
Photography ID: 316473
  Adult

Mar de Ajó
Buenos Aires
Argentina
01/23/2019
Diego Trillo



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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
196756628/12/2023ArgentinaBuenos AiresPlaya, Mar de AjóDiego Trillo
153758430/12/2021ArgentinaBuenos AiresMar de AjóDiego Trillo
145821220/08/2021ArgentinaBuenos AiresMar de AjóClaudio Mendez
119033828/01/2020ArgentinaBuenos AiresMédanos de la costa, Mar de AjóDiego Trillo
116227203/01/2020ArgentinaBuenos AiresMédanos de la costa, Mar de AjóFernando Iglesias
88616531/01/2019ArgentinaBuenos AiresMédanos de la costa, Mar de AjóDiego Trillo
88575130/01/2019ArgentinaBuenos AiresMédanos de la costa, Mar de AjóDiego Trillo
88573123/01/2019ArgentinaBuenos AiresMédanos de la costa, Mar de AjóDiego Trillo
88601322/01/2019ArgentinaBuenos AiresMédanos de la costa, Mar de AjóDiego Trillo
66473328/12/2017ArgentinaBuenos AiresMédanos de la costa, Mar de AjóDiego Trillo
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 19/04/2026.