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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: 230710
♂
  Adult

San Andrés de Giles
Buenos Aires
Argentina
11/25/2017
Juan Cruz Mena



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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
164880705/08/2022ArgentinaCórdobaDespeñaderosJuan Cruz Mena
156635717/02/2022ArgentinaCórdobaProyecto carayá, La CumbreJuan Cruz Mena
128343130/08/2020ArgentinaBuenos AiresAzcuenaga, San Andrés de GilesJuan Cruz Mena
124724323/05/2020ArgentinaBuenos AiresPaseo de las cañadas, San Andrés de GilesJuan Cruz Mena
86377818/12/2018ArgentinaCórdobaCalle merlo, Mina Clavero50Juan Cruz Mena
83348704/11/2018ArgentinaBuenos AiresCucullú, San Andrés de GilesJuan Cruz Mena
81997615/10/2018ArgentinaBuenos AiresRuta 41,casi llegando a san antonio de areco, San Andrés de GilesJuan Cruz Mena
81993015/10/2018ArgentinaBuenos AiresEstancia "la Porteña", San Antonio de Areco5Juan Cruz Mena
65482608/12/2017ArgentinaBuenos AiresClub de Caza y Pesca "el Dorado", San Andrés de Giles5Juan Cruz Mena
64743225/11/2017ArgentinaBuenos AiresCalle irigoyen, San Andrés de GilesJuan Cruz Mena
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.