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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 Parque Nacional Iberá

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: 680927
  Immature

Parque Nacional Iberá
Corrientes
Argentina
02/19/2026
Favio Belotto
Foto
Photography ID: 642949
  Adult

Parque Nacional Iberá
Corrientes
Argentina
07/13/2025
Aluminé Sangorrín
Foto
Photography ID: 385402
  Adult

Parque Nacional Iberá
Corrientes
Argentina
02/25/2020
Andrés Cecconi
Foto
Photography ID: 307893
  Adult

Parque Nacional Iberá
Corrientes
Argentina
10/29/2018
Elsa Longo
Foto
Photography ID: 292326
  Adult

Parque Nacional Iberá
Corrientes
Argentina
10/12/2018
Ricardo Juliano
Foto
Photography ID: 176638
  Adult

Parque Nacional Iberá
Corrientes
Argentina
10/08/2016
Roberto Battaglia



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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
252716712/09/2026ArgentinaCorrientesRuta 40 entre Colonia Carlos Peregrini y Rincon del Socorro, Parque Nacional Iberá30Diego Oscar
250541002/08/2026ArgentinaCorrientesPortal Lobo Cuá, Parque Nacional Iberá1Diego Oscar
245515619/02/2026ArgentinaCorrientesPortal Cambyretá, Parque Nacional IberáFavio Belotto
243330623/11/2025ArgentinaCorrientesPortal Cambyretá, Parque Nacional Iberá4Pablo Richter
239057023/11/2025ArgentinaCorrientesPortal Cambyretá, Parque Nacional Iberá4Gabriel Carbajales
235666611/09/2025ArgentinaCorrientesPortal Lobo Cuá, Parque Nacional Iberá3Diego Oscar
235575110/09/2025ArgentinaCorrientesRuta 40 entre Rincòn del Socorro y Carlos Pellegrini, Parque Nacional Iberá1Diego Oscar
235014913/08/2025ArgentinaCorrientesPortal Lobo Cuá, Parque Nacional Iberá2Diego Oscar
231933913/07/2025ArgentinaCorrientesLobo Cuá, Parque Nacional IberáAluminé Sangorrín
228835713/05/2025ArgentinaCorrientesLobo Cuá, Parque Nacional Iberá5Aluminé Sangorrín
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 14/09/2026.