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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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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: 580275
  Fledgling

San Carlos de Bariloche
Río Negro
Argentina
02/18/2012
Mariano Costa
Foto
Photography ID: 562878
♂
  Juvenile

San Carlos de Bariloche
Río Negro
Argentina
01/02/2024
Mariano Costa
Foto
Photography ID: 257508
♀
 

Las Grutas
Río Negro
Argentina
03/31/2018
Mariano Costa
Foto
Photography ID: 243988
♂
  Adult

Entre Lagos
Región de Los Lagos
Chile
01/26/2018
Mariano Costa
Foto
Photography ID: 122494
♂
  Adult

Laguna Los Juncos
Río Negro
Argentina
10/21/2015
Mariano Costa
Foto
Photography ID: 122493
♀
  Adult

Laguna Los Juncos
Río Negro
Argentina
10/21/2015
Mariano Costa
Foto
Photography ID: 35274
  Squab

Pucón
Región de la Araucanía
Chile
01/21/2014
Mariano Costa
Foto
Photography ID: 33843
♂ ♀
  Adult

El Manso Inferior
Río Negro
Argentina
01/12/2014
Mariano Costa



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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
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
218961013/11/2024ArgentinaRío NegroRuta Nacional 231Mariano Costa
196132331/01/2024ChileRegión de Los LagosSiete Islas, Huelmo1Mariano Costa
193734902/01/2024ArgentinaRío NegroModesta Victoria 5416, San Carlos de Bariloche1Mariano Costa
190437903/11/2023ChileRegión de Los LagosSiete Islas, Huelmo2Mariano Costa
151194223/10/2021ArgentinaRío NegroGob Pagano 622, Valcheta2Mariano Costa
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.