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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 Formosa

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: 648369
  Adult

Villa del Carmen
Formosa
Argentina
08/17/2025
Zulima América Schupbach
Foto
Photography ID: 647905
♂
  Adult

Villa del Carmen
Formosa
Argentina
08/14/2025
Zulima América Schupbach
Foto
Photography ID: 526947
♂
  Adult

Formosa
Formosa
Argentina
11/29/2022
José Luis Ianiro
Foto
Photography ID: 276231
♂
  Immature

Formosa Capital
Formosa
Argentina
04/30/2018
Julián Retamoza
Foto
Photography ID: 276230
♂
  Adult

Formosa Capital
Formosa
Argentina
10/28/2017
Julián Retamoza
Foto
Photography ID: 241917
♂
  Adult

Formosa Capital
Formosa
Argentina
01/20/2018
Martin Ferrari
Foto
Photography ID: 238781
♂
  Adult

Reserva El Bagual
Formosa
Argentina
09/30/2015
Vicente Piccirillo
Foto
Photography ID: 109446
♂
  Adult

Formosa Capital
Formosa
Argentina
07/28/2015
Eduardo Muñiz
Foto
Photography ID: 95421
♀
  Adult

Reserva de la Biosfera Laguna Oca
Formosa
Argentina
04/02/2015
Martin Ferrari



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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
237037030/09/2025ArgentinaFormosaNavegación Río Bermejo3Diego Oscar
234430017/08/2025ArgentinaFormosaRancho Galarza-lopez, Villa del CarmenZulima América Schupbach
234289114/08/2025ArgentinaFormosaRancho Galarza-lopez, Villa del CarmenZulima América Schupbach
232972208/07/2025ArgentinaFormosaBañado la Estrella, Bañado La Estrella1Facundo Carretero
212092221/07/2024ArgentinaFormosaHerradura, Formosa3Bc_pajareritos Agriornis
211627420/07/2024ArgentinaFormosaCamino A Cañada 12, Formosa5Bc_pajareritos Agriornis
211568619/07/2024ArgentinaFormosaReserva Guaycolec5Bc_pajareritos Agriornis
211287117/07/2024ArgentinaFormosaFormosa Golf Club, Formosa4Bc_pajareritos Agriornis
211523616/07/2024ArgentinaFormosaCosta del rio Paraguay, Costa Molusco10Lionel Medina
211514816/07/2024ArgentinaFormosaCosta del rio Paraguay, Costa Molusco10Bc_pajareritos Alectrurus
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 29/09/2026.