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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 de los Coipos, vereda exterior

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
143272624/07/2021ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)34Carlos Enrique Alvarez
142969818/07/2021ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)50Carlos Enrique Alvarez
138965703/04/2021ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)35Héctor Horacio García
129908506/09/2020ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)Eugenia Boggiano
89749809/03/2019ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)40Héctor Horacio García
79975727/08/2018ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)Julián Tocce
72416907/04/2018ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)13Héctor Horacio García
66916506/01/2018ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)Carlos Valpreda
66889106/01/2018ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)15Carlos Enrique Alvarez
31862515/08/2015ArgentinaCiudad Autónoma de Buenos AiresLaguna de los Coipos, vereda exterior, Reserva Ecológica Costanera Sur (RECS)Gaston Lisandro Gabinetti
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 04/10/2026.