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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

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Foto
Photography ID: 695247
♂ ♀
 
Comodoro Rivadavia
Chubut
Argentina
06/07/2026
Guillermo Enrique Rost
Foto
Photography ID: 186045
♂
  Adult

El Hoyo
Chubut
Argentina
01/18/2017
Guillermo Enrique Rost



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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
249483007/06/202620:02ArgentinaChubutComodoro Rivadavia, Comodoro Rivadavia150Guillermo Enrique Rost
249505302/05/202619:13ArgentinaChubutSarmiento2Guillermo Enrique Rost
196383531/01/2024ArgentinaChubutLaguna de Rada Tilly, Rada Tilly2Guillermo Enrique Rost
196369724/01/2024ArgentinaChubutColonia Sarmiento29Guillermo Enrique Rost
172895114/02/2023ArgentinaSanta CruzPuerto San Julián1Guillermo Enrique Rost
172530918/01/2023ArgentinaChubutColonia Sarmiento1Guillermo Enrique Rost
172834317/01/2023ArgentinaChubutEsquel1Guillermo Enrique Rost
172916312/01/2023ArgentinaChubutCholila7Guillermo Enrique Rost
169726403/01/2023ArgentinaChubutComodoro Rivadavia1Guillermo Enrique Rost
152774605/01/2022ArgentinaChubutComodoro Rivadavia40Guillermo Enrique Rost
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 01/10/2026.