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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: 605557
♂
  Adult

Asuncion
Distrito Capital
Paraguay
09/21/2024
Julián Tocce
Foto
Photography ID: 576016
♂
  Adult

Guazuvirá norte
Canelones
Uruguay
03/15/2024
Julián Tocce
Foto
Photography ID: 565696
♂
  Adult

Parque Nacional Lanín
Neuquén
Argentina
01/14/2024
Julián Tocce
Foto
Photography ID: 490580
♂
  Adult

Chajarí
Entre Ríos
Argentina
03/14/2022
Julián Tocce
Foto
Photography ID: 412823
♂
  Adult

General Roca
Río Negro
Argentina
09/27/2020
Julián Tocce
Foto
Photography ID: 397083
♂
  Adult

San Salvador de Jujuy
Jujuy
Argentina
06/23/2019
Julián Tocce
Foto
Photography ID: 256786
♂
  Adult

Rambla Parque Rodo
Montevideo
Uruguay
03/28/2018
Julián Tocce
Foto
Photography ID: 238972
♂
  Adult

General Roca
Río Negro
Argentina
01/08/2018
Julián Tocce
Foto
Photography ID: 193276
♂
  Adult

Viedma
Río Negro
Argentina
03/01/2017
Julián Tocce
Foto
Photography ID: 143664
♂
  Adult

Punta Carretas
Montevideo
Uruguay
03/21/2016
Julián Tocce



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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
217719421/09/2024ParaguayDistrito CapitalJardín Botánico de Asunción, AsuncionJulián Tocce
201104015/03/2024UruguayCanelonesCamino rural, Guazuvirá norteJulián Tocce
200760707/03/2024ArgentinaBuenos AiresPte. Raúl Ricardo Alfonsín 485, Pehuajo200Julián Tocce
195038515/01/2024ArgentinaNeuquénReserva Natural Urbana Cotesma, San Martin de los Andes2Julián Tocce
194922514/01/2024ArgentinaNeuquénCamping Bahía Cañicul, Parque Nacional Lanín6Julián Tocce
178730204/07/2023UruguayCanelonesDiagonal 1 23, Parque del Plata2Julián Tocce
174626909/04/2023ArgentinaRío NegroLa Tobiana, General Roca4Julián Tocce
165235829/09/2022ArgentinaCórdobaCamping Los Sanavirones, Miramar3Julián Tocce
165193228/09/2022ArgentinaCórdobaCamping Los Sanavirones, Miramar3Julián Tocce
164906124/09/2022ArgentinaSan LuisReserva Florofaunistica de Rincon del Este, Villa de Merlo2Julián 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.