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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
245943613/04/2026ArgentinaBuenos AiresAbra del Hinojo, Saavedra - Partido de Saavedra20Silvia Ana González
245946913/04/2026ArgentinaBuenos AiresCamino E/ Saavedra y Monte de Lenny10Silvia Ana González
178916812/11/2022ArgentinaCiudad Autónoma de Buenos AiresOlavarría 576, La Boca3Silvia Ana González
178914830/10/2022ArgentinaBuenos AiresErnesto Craig 158, AbbottSilvia Ana González
152526301/01/2022ArgentinaCiudad Autónoma de Buenos AiresCiudad Autónoma de Buenos Aires4Silvia Ana González
138582027/03/2021ArgentinaBuenos AiresPilarSilvia Ana González
116180107/01/2020ArgentinaCiudad Autónoma de Buenos AiresAcceso Viamonte, Reserva Ecológica Costanera Sur (RECS)7Silvia Ana González
114436108/12/2019ArgentinaCiudad Autónoma de Buenos AiresAvenida Intendente Hernan M. Giralt, Reserva Ecológica Costanera Sur (RECS)Silvia Ana González
114704402/12/2019ArgentinaCorrientesConcepción del Yaguareté CoráSilvia Ana González
114674830/11/2019ArgentinaCorrientesRuta Nacional 119 80-74 (-29,411309, -58,195708)5Silvia Ana González
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.