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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 Tandil

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: 669769
  Adult

Tandil
Buenos Aires
Argentina
01/02/2026
Liliana Rubilar Puerta
Foto
Photography ID: 634141
  Adult

Tandil
Buenos Aires
Argentina
05/11/2025
Liliana Rubilar Puerta
Foto
Photography ID: 618641
  Adult

Tandil
Buenos Aires
Argentina
01/11/2025
Liliana Rubilar Puerta
Foto
Photography ID: 579295
  Adult

Tandil
Buenos Aires
Argentina
03/28/2024
Patricia Gabriela Mancilla Iglesias
Foto
Photography ID: 564170
  Adult

Tandil
Buenos Aires
Argentina
01/09/2024
Liliana Rubilar Puerta
Foto
Photography ID: 508398
  Adult

Tandil
Buenos Aires
Argentina
09/22/2022
Patricia Gabriela Mancilla Iglesias
Foto
Photography ID: 238542
 
Tandil
Buenos Aires
Argentina
11/16/2017
Fernando Iglesias
Foto
Photography ID: 170303
  Adult

Tandil
Buenos Aires
Argentina
10/09/2016
Guillermo Garcia
Foto
Photography ID: 148823
  Squab

Tandil
Buenos Aires
Argentina
01/11/2015
Claudia Alejandra Nigro
Foto
Photography ID: 131321
  Adult

Tandil
Buenos Aires
Argentina
11/29/2015
Diego Villalba
Foto
Photography ID: 67875
  Adult

Tandil
Buenos Aires
Argentina
11/04/2014
Santiago Juan Torres
Foto
Photography ID: 56169
 
Tandil
Buenos Aires
Argentina
07/03/2014
Alfonso Fernandez



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
244156303/03/202619:31ArgentinaBuenos AiresCabañas Edén Soñado, Tandil6Santiago Juan Torres
244155302/03/202619:12ArgentinaBuenos AiresCabañas Edén Soñado, Tandil10Santiago Juan Torres
243545917/02/2026ArgentinaBuenos AiresCerro Los Nogales, TandilLiliana Rubilar Puerta
243543017/02/2026ArgentinaBuenos AiresMonte calvario, TandilLiliana Rubilar Puerta
243541716/02/2026ArgentinaBuenos AiresLaguna Los Coscorobas, TandilLiliana Rubilar Puerta
243540516/02/2026ArgentinaBuenos AiresMaría Ignacia - Vela, TandilLiliana Rubilar Puerta
243187608/02/2026ArgentinaBuenos AiresCamino rural Tandil - Azucena, TandilLiliana Rubilar Puerta
243183207/02/2026ArgentinaBuenos AiresAcceso a Fulton, TandilLiliana Rubilar Puerta
243181507/02/2026ArgentinaBuenos AiresArroyo La Cerrillada, TandilLiliana Rubilar Puerta
242463828/01/2026ArgentinaBuenos AiresCamino rural Tandil - Azucena, TandilLiliana Rubilar Puerta
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.