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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 Laguna larga

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: 379227
♂
  Adult

Laguna Larga
Córdoba
Argentina
02/01/2020
Jorge Schlemmer
Foto
Photography ID: 366903
♂ ♀
  Adult

Laguna Larga
Córdoba
Argentina
12/07/2019
Jorge Schlemmer
Foto
Photography ID: 352132
♂ ♀
  Adult

Laguna Larga
Córdoba
Argentina
09/21/2019
Jorge Schlemmer
Foto
Photography ID: 243847
♂
  Adult

Laguna Larga
Córdoba
Argentina
01/28/2018
Jorge Schlemmer



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
217657413/10/2024ArgentinaCórdobaLaguna larga, Laguna Larga8Dario Juan Wendeler
135158517/01/2021ArgentinaCórdobaLaguna larga, Laguna LargaPablo Eguia
118383401/02/2020ArgentinaCórdobaLaguna larga, Laguna LargaHugo Caverzasi
118369101/02/2020ArgentinaCórdobaLaguna larga, Laguna LargaJorge Schlemmer
114418407/12/2019ArgentinaCórdobaLaguna larga, Laguna LargaJorge Schlemmer
102853121/09/2019ArgentinaCórdobaLaguna larga, Laguna LargaJorge Schlemmer
68738328/01/2018ArgentinaCórdobaLaguna larga, Laguna LargaJorge Schlemmer
63281828/10/2017ArgentinaCórdobaLaguna larga, Laguna LargaEnzo Rossi
55907428/01/2017ArgentinaCórdobaLaguna larga, Laguna LargaEnzo Rossi
47682031/05/2016ArgentinaCórdobaLaguna larga, Laguna Larga6Dario Juan Wendeler
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 02/10/2026.