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Molothrus bonariensis

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 Ciudad de Mendoza

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





Geographic distribution


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Species photographs

Last published photographs

Foto
Photography ID: 647176
♂
  Adult

Ciudad de Mendoza
Mendoza
Argentina
08/06/2025
Manuel Godoy
Foto
Photography ID: 568305
♂
 

Ciudad de Mendoza
Mendoza
Argentina
01/31/2024
Pablo Moreno
Foto
Photography ID: 548715
♀
  Adult

Ciudad de Mendoza
Mendoza
Argentina
09/16/2023
Pablo Moreno
Foto
Photography ID: 513978
♀
  Adult

Ciudad de Mendoza
Mendoza
Argentina
11/09/2022
Diego Alfonso Rosa
Foto
Photography ID: 214921
♂
  Adult

Ciudad de Mendoza
Mendoza
Argentina
07/15/2017
Walter Bustamante
Foto
Photography ID: 150875
♀
  Adult

Ciudad de Mendoza
Mendoza
Argentina
05/22/2016
Valentín González Feltrup
Foto
Photography ID: 23969
♂
  Adult

Ciudad de Mendoza
Mendoza
Argentina
07/02/2013
Walter Prado
Foto
Photography ID: 8560
♂
  Adult

Ciudad de Mendoza
Mendoza
Argentina
09/03/2011
Jorge Torija Zane



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Species vocalizations

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Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
248500413/06/2026ArgentinaMendozaParque General San Martin, Ciudad de Mendoza4Pablo Moreno
248128630/05/2026ArgentinaMendozaParque General San Martín, Ciudad de Mendoza4Pablo Moreno
247578509/05/2026ArgentinaMendozaParque General San Martín, Ciudad de Mendoza7Pablo Moreno
244297716/02/2026ArgentinaMendozaParque General San Martín, Ciudad de Mendoza8Pablo Moreno
240311920/12/2025ArgentinaMendozaParque General San Martin, Ciudad de Mendoza6Pablo Moreno
239978613/12/2025ArgentinaMendozaParque General San Martín, Ciudad de Mendoza3Pablo Moreno
239730004/12/2025ArgentinaMendozaParque General San Martin, Ciudad de Mendoza4Pablo Moreno
238859022/11/2025ArgentinaMendozaParque General San Martín, Ciudad de Mendoza6Pablo Moreno
238424709/11/2025ArgentinaMendozaParque General San Martin, Ciudad de Mendoza10Pablo Moreno
238428108/11/2025ArgentinaMendozaParque General San Martin, Ciudad de Mendoza6Pablo Moreno
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) – Species account. Accessed from www.ecoregistros.org on 28/09/2026.