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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 Reserva Ecológica Lago Lugano

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
242796604/02/2026ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano1Gabriel Carbajales
192823909/12/2023ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano3Sebastián Otero
179357616/07/2023ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano25Sebastián Otero
168988517/12/2022ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano10Sebastián Otero
166588322/10/2022ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano16Héctor Horacio García
166060322/10/2022ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano10Carlos Enrique Alvarez
148113316/10/2021ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano20Sebastián Otero
118951209/02/2020ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago LuganoGonzalo Diaz
115426926/12/2019ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago LuganoGonzalo Diaz
102827621/09/2019ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago Lugano6Sebastián Otero
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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 15/04/2026.