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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: 702304
  Adult

Cortaderas
San Luis
Argentina
08/26/2026
Hugo Alberto Valderrey
Foto
Photography ID: 699245
  Adult

Marull
Córdoba
Argentina
08/08/2026
Hugo Alberto Valderrey
Foto
Photography ID: 698377
  Adult

Icaño
Catamarca
Argentina
08/03/2026
Hugo Alberto Valderrey
Foto
Photography ID: 696247
  Adult

General Pico
La Pampa
Argentina
07/19/2026
Hugo Alberto Valderrey
Foto
Photography ID: 694101
♂ ♀
  Adult

Quemú Quemú
La Pampa
Argentina
07/09/2026
Hugo Alberto Valderrey
Foto
Photography ID: 686999
  Adult

Ruta 20
San Luis
Argentina
04/07/2026
Hugo Alberto Valderrey
Foto
Photography ID: 671590
  Adult

Lujan
San Luis
Argentina
12/31/2024
Hugo Alberto Valderrey
Foto
Photography ID: 666957
  Adult

General Pico
La Pampa
Argentina
01/07/2026
Hugo Alberto Valderrey
Foto
Photography ID: 665942
  Adult

Malargüe
Mendoza
Argentina
01/01/2026
Hugo Alberto Valderrey
Foto
Photography ID: 662232
  Fledgling

General Pico
La Pampa
Argentina
12/04/2025
Hugo Alberto Valderrey



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Species vocalizations

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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
252019628/08/2026ArgentinaSan LuisRio lujan, Reserva Natural Estricta Quebrada de las HigueritasHugo Alberto Valderrey
251831126/08/2026ArgentinaSan LuisDique piscu yaco hacia la sierra, CortaderasHugo Alberto Valderrey
251057508/08/2026ArgentinaCórdobaCamping de Marull, MarullHugo Alberto Valderrey
250778503/08/2026ArgentinaCatamarcaRp2 entre Icaño y San Antonio de la Paz, IcañoHugo Alberto Valderrey
249927719/07/2026ArgentinaLa PampaBarrio Pueblo Nuevo, General PicoHugo Alberto Valderrey
249211909/07/2026ArgentinaLa PampaEn cercanías de Quemú Quemú, Quemú QuemúHugo Alberto Valderrey
247039507/04/2026ArgentinaSan LuisEntre Sierra de las Quijadas y Lujan, Ruta 20Hugo Alberto Valderrey
241491107/01/2026ArgentinaLa PampaBarrio Pueblo Nuevo, General PicoHugo Alberto Valderrey
241090101/01/2026ArgentinaMendozaMalargüe, MalargüeHugo Alberto Valderrey
239677404/12/2025ArgentinaLa PampaBarrio Pueblo Nuevo, General PicoHugo Alberto Valderrey
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.