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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 Henderson

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: 677808
  Adult

Henderson
Buenos Aires
Argentina
03/16/2026
Juan Manuel Canepa
Foto
Photography ID: 653681
  Adult

Henderson
Buenos Aires
Argentina
09/15/2025
Zulima América Schupbach
Foto
Photography ID: 653653
♂ ♀
  Adult

Henderson
Buenos Aires
Argentina
09/15/2025
Zulima América Schupbach
Foto
Photography ID: 639965
  Adult

Henderson
Buenos Aires
Argentina
06/19/2025
Juan Manuel Canepa
Foto
Photography ID: 573880
  Immature

Henderson
Buenos Aires
Argentina
02/29/2024
Juan Manuel Canepa
Foto
Photography ID: 573879
  Immature

Henderson
Buenos Aires
Argentina
02/29/2024
Juan Manuel Canepa
Foto
Photography ID: 564765
  Adult

Henderson
Buenos Aires
Argentina
01/13/2024
Juan Manuel Canepa
Foto
Photography ID: 540691
  Adult

Henderson
Buenos Aires
Argentina
07/06/2023
Juan Manuel Canepa
Foto
Photography ID: 540688
  Adult

Henderson
Buenos Aires
Argentina
07/06/2023
Juan Manuel Canepa
Foto
Photography ID: 509311
  Adult

Henderson
Buenos Aires
Argentina
10/01/2022
Juan Manuel Canepa
Foto
Photography ID: 506974
  Adult

Henderson
Buenos Aires
Argentina
09/08/2022
Juan Manuel Canepa
Foto
Photography ID: 410651
♂ ♀
  Adult

Henderson
Buenos Aires
Argentina
09/01/2020
Juan Manuel Canepa



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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
244742816/03/2026ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
236814515/09/2025ArgentinaBuenos AiresHendersonZulima América Schupbach
230700719/06/2025ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
200583729/02/2024ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
200583629/02/2024ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
194638813/01/2024ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
178822306/07/2023ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
178822206/07/2023ArgentinaBuenos AiresCerca de Herrera Vegas, HendersonJuan Manuel Canepa
164767501/10/2022ArgentinaBuenos AiresHendersonJuan Manuel Canepa
163808708/09/2022ArgentinaBuenos AiresHendersonJuan Manuel Canepa
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 15/04/2026.