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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 San Miguel del Monte

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: 623594
  Adult

San Miguel del Monte
Buenos Aires
Argentina
02/17/2025
Hernán Tolosa
Foto
Photography ID: 604541
  Adult

San Miguel del Monte
Buenos Aires
Argentina
10/11/2024
Gustavo Pascuas
Foto
Photography ID: 562730
  Adult

San Miguel del Monte
Buenos Aires
Argentina
01/02/2024
Jorgelina Lopez
Foto
Photography ID: 414411
  Adult

San Miguel del Monte
Buenos Aires
Argentina
09/19/2015
Vicente Piccirillo
Foto
Photography ID: 215343
  Adult

San Miguel del Monte
Buenos Aires
Argentina
07/01/2017
Ricardo A. Palonsky
Foto
Photography ID: 207610
♂ ♀
  Adult

San Miguel del Monte
Buenos Aires
Argentina
06/20/2017
Hernán Tolosa
Foto
Photography ID: 172551
  Adult

San Miguel del Monte
Buenos Aires
Argentina
10/22/2016
Hernán Tolosa
Foto
Photography ID: 165639
  Adult

San Miguel del Monte
Buenos Aires
Argentina
09/03/2016
Hernán Tolosa
Foto
Photography ID: 98600
  Adult

San Miguel del Monte
Buenos Aires
Argentina
05/17/2015
Hernán Tolosa
Foto
Photography ID: 79799
  Juvenile

San Miguel del Monte
Buenos Aires
Argentina
01/25/2015
Hernán Tolosa
Foto
Photography ID: 3713
  Adult

San Miguel del Monte
Buenos Aires
Argentina
05/14/2009
Hernán Tolosa



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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
239690307/12/2025ArgentinaBuenos AiresSan Miguel del MonteHernán Tolosa
234920230/08/2025ArgentinaBuenos AiresLa Blanqueada, San Miguel del MonteHernán Tolosa
231611306/07/2025ArgentinaBuenos AiresSan Miguel del MonteHernán Tolosa
228037105/04/2025ArgentinaBuenos AiresFrancisco A. Berra, San Miguel del Monte20Diego Oscar
225421717/02/2025ArgentinaBuenos AiresBasural, San Miguel del MonteHernán Tolosa
216873311/10/2024ArgentinaBuenos AiresSan Miguel del Monte, San Miguel del MonteGustavo Pascuas
210923811/07/2024ArgentinaBuenos AiresFrancisco A. Berra, San Miguel del MonteJorgelina Lopez
210897411/07/2024ArgentinaBuenos AiresFrancisco A. Berra, San Miguel del MonteHernán Tolosa
203247311/05/2024ArgentinaBuenos AiresFrancisco A. Berra, San Miguel del MonteHernán Tolosa
201333719/03/2024ArgentinaBuenos AiresLaguna de Monte, San Miguel del Monte4Gabriel Carbajales
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.