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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: 695431
♂
  Adult

Partido de Necochea
Buenos Aires
Argentina
07/16/2026
Fernando Alberto Segura
Foto
Photography ID: 401886
♂
  Immature

Tornquist
Buenos Aires
Argentina
02/23/2020
Fernando Alberto Segura
Foto
Photography ID: 239070
♂
  Adult

Necochea
Buenos Aires
Argentina
01/05/2018
Fernando Alberto Segura
Foto
Photography ID: 188115
♂
  Adult

Necochea
Buenos Aires
Argentina
01/07/2017
Fernando Alberto Segura
Foto
Photography ID: 143303
♂
  Immature

Necochea
Buenos Aires
Argentina
03/06/2016
Fernando Alberto Segura
Foto
Photography ID: 136380
♀
  Adult

Necochea
Buenos Aires
Argentina
02/01/2016
Fernando Alberto Segura
Foto
Photography ID: 110079
♂
  Adult

Necochea
Buenos Aires
Argentina
08/15/2015
Fernando Alberto Segura



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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
249572116/07/2026ArgentinaBuenos AiresLaguna zabala, Partido de NecocheaFernando Alberto Segura
204626809/04/2024ArgentinaBuenos AiresPemsa, Partido de General AlvaradoFernando Alberto Segura
202636716/10/2023ArgentinaMisionesCamping del cuñapirú, Cainguás2Fernando Alberto Segura
202624614/10/2023ArgentinaMisionesReserva Natural Silvestre Parque Federal Campo San Juan, Santa Ana2Fernando Alberto Segura
180899023/07/2023ArgentinaBuenos AiresIsla Talavera, ZárateFernando Alberto Segura
169697219/12/2022ArgentinaBuenos AiresReserva Natural El DestinoFernando Alberto Segura
169690018/12/2022ArgentinaBuenos AiresPunta Indio, Parque Costero del SurFernando Alberto Segura
167621105/11/2022ArgentinaBuenos AiresEl Puesto, Partido de VillarinoFernando Alberto Segura
153784706/01/2022ArgentinaBuenos AiresLaguna Tupungato7Fernando Alberto Segura
152650402/01/2022ArgentinaBuenos AiresCamino rural ingresando por El Palenque, General Lavalle14Fernando Alberto Segura
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.