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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





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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
227437825/08/2024ArgentinaCorrientesReserva Natural Laguna Brava, Laguna Brava, Corrientes CapitalEsteban Geronimo Javier Luque
226530325/08/2024ArgentinaCorrientesReserva natural laguna brava, CorrientesEsteban Geronimo Javier Luque
53411008/01/2017ArgentinaCorrientesMburucuyá pueblo hasta cañada fragosa, Mburucuyá (localidad)10Esteban Geronimo Javier Luque
47164527/08/2016ArgentinaCorrientesDel pueblo unos kilometros por la ruta provincial 13, Manantiales8Esteban Geronimo Javier Luque
46390807/08/2016ArgentinaCorrientesDesde la entrada del parque hasta el centro de visitantes, Mburucuyá (localidad)5Esteban Geronimo Javier Luque
46383806/08/2016ArgentinaCorrientesMburucuyá pueblo hasta cañada fragosa, Mburucuyá (localidad)4Esteban Geronimo Javier Luque
47156327/07/2016ArgentinaCorrientesMburucuyá pueblo hasta cañada fragosa, Mburucuyá (localidad)14Esteban Geronimo Javier Luque
45010006/07/2016ArgentinaCorrientesDesde el pueblo hasta el balneario, Perugorria36Esteban Geronimo Javier Luque
44185604/06/2016ArgentinaCorrientesMburucuyá pueblo hasta cañada fragosa, Mburucuyá (localidad)17Esteban Geronimo Javier Luque
44182601/06/2016ArgentinaCorrientesCamino paraje Palmitas, Perugorria12Esteban Geronimo Javier Luque
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.