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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 Villaguay

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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Last published photographs

Foto
Photography ID: 569585
 
Villaguay
Entre Ríos
Argentina
05/14/2022
Pablo Bruni
Foto
Photography ID: 569584
 
Villaguay
Entre Ríos
Argentina
05/14/2022
Pablo Bruni



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
239084024/11/2025ArgentinaEntre RíosReserva De Usos Múltiples El Guayabo, Villaguay7Pablo Bruni
238973423/11/2025ArgentinaEntre RíosArroyo Mojones, Villaguay2Pablo Bruni
238967423/11/2025ArgentinaEntre RíosZona Paso Balsa San Justo, Villaguay6Pablo Bruni
234326116/08/2025ArgentinaEntre RíosCamino a Arroyo Sauce de Luna, Villaguay35Pablo Bruni
234324516/08/2025ArgentinaEntre RíosLaguna zona Mojones Norte, Villaguay14Pablo Bruni
234319616/08/2025ArgentinaEntre RíosPaso Blanco, Villaguay1Pablo Bruni
234313816/08/2025ArgentinaEntre RíosCamino a Paso Blanco, Villaguay4Pablo Bruni
211439218/07/2024ArgentinaEntre RíosReserva Natural Huella del Monte, Villaguay1Pablo Bruni
211430018/07/2024ArgentinaEntre RíosVía sin nombre, Villaguay1Bc_pajareritos Playeritos
211425618/07/2024ArgentinaEntre RíosVía sin nombre, Villaguay1Faustino Hollmann
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 10/04/2026.