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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: 685912
♀
  Adult

General Pico
La Pampa
Argentina
05/09/2026
Margarita Cervio
Foto
Photography ID: 566257
♂
  Adult

General Pico
La Pampa
Argentina
01/19/2024
Margarita Cervio
Foto
Photography ID: 562902
♂
  Adult

General Pico
La Pampa
Argentina
01/01/2024
Margarita Cervio
Foto
Photography ID: 449238
♂
  Adult

General Pico
La Pampa
Argentina
06/09/2021
Margarita Cervio
Foto
Photography ID: 430533
♀
  Adult

General Pico
La Pampa
Argentina
01/10/2021
Margarita Cervio
Foto
Photography ID: 428206
♂
  Adult

General Pico
La Pampa
Argentina
01/06/2021
Margarita Cervio
Foto
Photography ID: 415817
♀
  Adult

General Pico
La Pampa
Argentina
10/17/2020
Margarita Cervio
Foto
Photography ID: 391456
♂
  Immature

General Pico
La Pampa
Argentina
03/26/2020
Margarita Cervio
Foto
Photography ID: 308820
♂
  Adult

General Pico
La Pampa
Argentina
07/30/2018
Margarita Cervio
Foto
Photography ID: 128038
♀
  Adult

General Pico
La Pampa
Argentina
07/06/2015
Margarita Cervio
Foto
Photography ID: 126250
♂
  Adult

General Pico
La Pampa
Argentina
11/20/2015
Margarita Cervio
Foto
Photography ID: 64531
♀
  Adult

Reserva Provincial Parque Luro
La Pampa
Argentina
10/05/2014
Margarita Cervio



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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
246845109/05/2026ArgentinaLa PampaPatio de mi casa, General PicoMargarita Cervio
195340919/01/2024ArgentinaLa PampaBarrio los Horneros, General PicoMargarita Cervio
193764801/01/2024ArgentinaLa PampaPatio de mi casa, General PicoMargarita Cervio
141302209/06/2021ArgentinaLa PampaPatio de mi casa, General PicoMargarita Cervio
135413410/01/2021ArgentinaLa PampaPatio de mi casa, General PicoMargarita Cervio
134563706/01/2021ArgentinaLa PampaEn cercanías de un barrio llamado Pueblo Nuevo, General PicoMargarita Cervio
130264017/10/2020ArgentinaLa PampaPatio de mi casa, General PicoMargarita Cervio
129776226/03/2020ArgentinaLa PampaPatio de mi casa, General PicoMargarita Cervio
86399730/07/2018ArgentinaLa PampaReserva Natural Urbana Benicio Delfín Pérez, General PicoMargarita Cervio
36516720/11/2015ArgentinaLa PampaGeneral PicoMargarita Cervio
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 01/10/2026.