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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 Montevideo

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: 454847
♂
  Adult

Montevideo
Montevideo
Uruguay
07/26/2021
Javier Laprebendere
Foto
Photography ID: 376498
♂
  Adult

Rambla Gandhi
Montevideo
Uruguay
01/05/2020
Virginia Bonifacio
Foto
Photography ID: 298209
♂
  Adult

Montevideo
Montevideo
Uruguay
11/12/2018
Hernan Bauret
Foto
Photography ID: 274420
♂
  Adult

Punta Carretas
Montevideo
Uruguay
05/01/2018
Mauricio Silvera
Foto
Photography ID: 256791
  Adult

Punta Carretas
Montevideo
Uruguay
03/28/2018
Alicia Miller
Foto
Photography ID: 256786
♂
  Adult

Rambla Parque Rodo
Montevideo
Uruguay
03/28/2018
Julián Tocce
Foto
Photography ID: 163012
♂
  Adult

Montevideo
Montevideo
Uruguay
08/19/2016
Adrian Antunez
Foto
Photography ID: 143664
♂
  Adult

Punta Carretas
Montevideo
Uruguay
03/21/2016
Julián Tocce
Foto
Photography ID: 121821
♂
  Adult

Parque Rivera
Montevideo
Uruguay
10/25/2015
Adrian Antunez
Foto
Photography ID: 102131
♂
  Adult

Rambla Parque Rodo
Montevideo
Uruguay
06/13/2015
Adrian Antunez
Foto
Photography ID: 52644
  Juvenile

Montevideo
Montevideo
Uruguay
01/31/2014
Gustavo Miguel Casás Ksiazenicki
Foto
Photography ID: 49901
♂
  Adult

Montevideo
Montevideo
Uruguay
05/03/2014
Adrian Antunez



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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
232068215/07/2025UruguayMontevideo4073 Bulevar General Artigas, Montevideo, Departamento de Montevideo, Montevideo2Faustino Hollmann
232067215/07/2025UruguayMontevideo5164 Paralela Sur, Montevideo, Departamento de Montevideo, Montevideo18Faustino Hollmann
143510826/07/2021UruguayMontevideoMontevideoJavier Laprebendere
117528705/01/2020UruguayMontevideoRambla Gandhi4Virginia Bonifacio
86341429/12/2018UruguayMontevideoJardín Botánico, MontevideoDiego Oscar
83764912/11/2018UruguayMontevideoPlaya Carrasco, MontevideoHernan Bauret
76142429/05/2018UruguayMontevideoCarrasco Norte50Pablo Balduvino Navascués
77610601/05/2018UruguayMontevideoPunta CarretasMauricio Silvera
71918228/03/2018UruguayMontevideoPunta CarretasAlicia Miller
71917628/03/2018UruguayMontevideoRambla Parque RodoJulián Tocce
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 30/09/2026.