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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 Gorchs

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: 375096
  Adult

Gorchs
Buenos Aires
Argentina
01/15/2020
Ricardo Juliano
Foto
Photography ID: 220568
  Adult

Gorchs
Buenos Aires
Argentina
09/23/2017
Guillermo Marcaida
Foto
Photography ID: 135410
  Juvenile

Gorchs
Buenos Aires
Argentina
01/24/2016
Hernán Tolosa
Foto
Photography ID: 92416
♂ ♀
  Adult

Gorchs
Buenos Aires
Argentina
04/03/2015
Ricardo Juliano



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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
243849224/01/2026ArgentinaBuenos AiresGorchsHernán Tolosa
241098305/01/2026ArgentinaBuenos AiresEa la 37, GorchsRicardo Juliano
195086618/01/2024ArgentinaBuenos AiresEstancia El Infierno, GorchsHernán Tolosa
193670401/01/2024ArgentinaBuenos AiresEa la 37, GorchsRicardo Juliano
170122012/01/2023ArgentinaBuenos AiresEa la 37, GorchsRicardo Juliano
139011230/03/2021ArgentinaBuenos AiresGorchsElsa Longo
134048101/01/2021ArgentinaBuenos AiresEa la 37, GorchsRicardo Juliano
132961307/12/2020ArgentinaBuenos AiresGorchsElsa Longo
132761907/12/2020ArgentinaBuenos AiresGorchsGuillermo Marcaida
129216919/09/2020ArgentinaBuenos AiresGorchsJorgelina Lopez
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 10/04/2026.