Don't want to see ads? Sign up...




Molothrus bonariensis

Shiny Cowbird


Molothrus bonariensis

(Gmelin, JF, 1789)
Tordo Renegrido
Chupim

Family: Icteridae
Order: Passeriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

 Request change




Filters



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


Loading map...




Species photographs

Last published photographs

Foto
Photography ID: 514121
♂
  Adult

Yala (pueblo)
Jujuy
Argentina
11/11/2022
Daniel Osvaldo Fernández
Foto
Photography ID: 514120
♀
  Adult

Yala (pueblo)
Jujuy
Argentina
11/11/2022
Daniel Osvaldo Fernández
Foto
Photography ID: 514105
♂
  Adult

Alrededores de Cachi
Salta
Argentina
11/07/2022
Daniel Osvaldo Fernández
Foto
Photography ID: 506805
♂
  Adult

Ceibas
Entre Ríos
Argentina
09/03/2022
Daniel Osvaldo Fernández
Foto
Photography ID: 475494
  Adult

Ceibas
Entre Ríos
Argentina
09/18/2021
Daniel Osvaldo Fernández
Foto
Photography ID: 467629
  Adult

Tornquist
Buenos Aires
Argentina
10/04/2021
Daniel Osvaldo Fernández
Foto
Photography ID: 457848
 
Ceibas
Entre Ríos
Argentina
08/14/2021
Daniel Osvaldo Fernández
Foto
Photography ID: 363105
♂ ♀
  Adult

Delta del Paraná
Buenos Aires
Argentina
11/09/2019
Daniel Osvaldo Fernández
Foto
Photography ID: 356014
♀
  Adult

Esteros del Iberá
Corrientes
Argentina
10/13/2018
Daniel Osvaldo Fernández



 View all photographs of the species




 Add a photography of this species






Species vocalizations

Last vocalizations published



 Add an audio of this species





Species videos

Last filmings published




 Add a film of this species





Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
167463311/11/2022ArgentinaJujuyRuta de ingreso al P P Potrero de Yala, Yala (pueblo)Daniel Osvaldo Fernández
167462207/11/2022ArgentinaSaltaLa Paya, Alrededores de CachiDaniel Osvaldo Fernández
163665103/09/2022ArgentinaEntre RíosCamino rural, CeibasDaniel Osvaldo Fernández
162795413/08/2022ArgentinaMisionesReserva Privada y Ecolodge SurucuáDaniel Osvaldo Fernández
162787913/08/2022ArgentinaMisionesJardín de los Picaflores, Puerto IguazúDaniel Osvaldo Fernández
159484728/05/2022ArgentinaBuenos AiresCamping Cielo, Delta del ParanáDaniel Osvaldo Fernández
159518027/03/2022ArgentinaLa Pampalaguna don tomás, Santa RosaDaniel Osvaldo Fernández
159509926/03/2022ArgentinaLa PampaReserva Provincial Parque LuroDaniel Osvaldo Fernández
159502625/03/2022ArgentinaLa PampaReserva natural de UltracanDaniel Osvaldo Fernández
159492724/03/2022ArgentinaLa PampaReserva La Malvina., Santa RosaDaniel Osvaldo Fernández
Page 1

 Add a record of this species

📖
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 01/10/2026.