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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 Río Negro

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: 665753
  Juvenile

Teniente Pereyra Ramos
Río Negro
Argentina
01/03/2026
Mariano Costa
Foto
Photography ID: 622926
♂
  Adult

Choele Choel
Río Negro
Argentina
11/29/2024
Ariel Alejandro Vazquez
Foto
Photography ID: 622925
♀
  Adult

Choele Choel
Río Negro
Argentina
11/29/2024
Ariel Alejandro Vazquez
Foto
Photography ID: 620508
♂
  Adult

Rio pichi leufu
Río Negro
Argentina
01/20/2025
Ricardo Juliano
Foto
Photography ID: 591232
♂
  Adult

El Cuy
Río Negro
Argentina
10/13/2023
Tiziano Luka Pesci Rubilar
Foto
Photography ID: 580275
  Fledgling

San Carlos de Bariloche
Río Negro
Argentina
02/18/2012
Mariano Costa
Foto
Photography ID: 577918
♂
  Immature

Viedma
Río Negro
Argentina
03/08/2024
Carlos De Biagi
Foto
Photography ID: 562878
♂
  Juvenile

San Carlos de Bariloche
Río Negro
Argentina
01/02/2024
Mariano Costa
Foto
Photography ID: 493118
  Fledgling

Las Grutas
Río Negro
Argentina
11/25/2021
Jorge La Grotteria
Foto
Photography ID: 461932
♂
  Adult

General Conesa
Río Negro
Argentina
09/04/2021
Manuel Godoy
Foto
Photography ID: 412823
♂
  Adult

General Roca
Río Negro
Argentina
09/27/2020
Julián Tocce
Foto
Photography ID: 384830
  Juvenile

Adolfo Alsina
Río Negro
Argentina
01/31/2020
Pablo Asaroff



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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
251587824/08/202610:48ArgentinaRío NegroRuta Nacional 1511Mariano Costa
242563430/01/202612:41ArgentinaRío NegroRuta Nacional 2511Patricia Beatriz Benitez
241978222/01/202617:32ArgentinaRío NegroPunta Colorada15Patricia Beatriz Benitez
241942521/01/202620:12ArgentinaRío NegroRuta Nacional 31Patricia Beatriz Benitez
241013003/01/202608:19ArgentinaRío NegroTeniente Pereyra Ramos1Mariano Costa
240960603/01/202609:47ArgentinaRío NegroEstados Unidos 394, Dina HuapiMariano Costa
240288120/12/2025ArgentinaRío NegroRp1 / R40s Entrada a Ñorquinco, Ñorquinco1Mariano Costa
238014027/10/202517:13ArgentinaRío NegroRuta Provincial 822Mariano Costa
232906831/07/202510:53ArgentinaRío NegroJuan XXIII 1000, Cipolletti4Juan Franco Sepumir
224227520/01/2025ArgentinaRío NegroRio pichi leufuRicardo Juliano
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 29/09/2026.