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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 Gualeguaychú

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: 563773
  Adult

Gualeguaychú
Entre Ríos
Argentina
01/07/2024
Gustavo Puente
Foto
Photography ID: 413470
  Adult

Gualeguaychú
Entre Ríos
Argentina
08/27/2019
Mario Daniel Piccini
Foto
Photography ID: 413347
  Immature

Gualeguaychú
Entre Ríos
Argentina
01/11/2020
Mario Daniel Piccini
Foto
Photography ID: 204469
  Adult

Gualeguaychú
Entre Ríos
Argentina
05/03/2017
Rodolfo Julio Velazquez
Foto
Photography ID: 132763
  Adult

Gualeguaychú
Entre Ríos
Argentina
01/07/2016
Gustavo Puente
Foto
Photography ID: 41942
  Adult

Gualeguaychú
Entre Ríos
Argentina
03/05/2014
Gustavo Puente
Foto
Photography ID: 41933
  Adult

Gualeguaychú
Entre Ríos
Argentina
03/05/2014
Gustavo Puente



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 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
238564812/11/2025ArgentinaEntre RíosRuta Provincial 42, Gualeguaychú3Susana Gomez
198067515/02/2024ArgentinaEntre RíosParque Unzué, GualeguaychúElsa Longo
194135507/01/2024ArgentinaEntre RíosCamino a Ñandubaysal, GualeguaychúGustavo Puente
188871116/09/2023ArgentinaEntre RíosCostanera del Gualeguaychú, GualeguaychúGuillermo Alejandro Nelson Tarapow
160614704/06/2022ArgentinaEntre RíosGualeguaychúPatricia Gabriela Mancilla Iglesias
199903205/01/2021ArgentinaEntre RíosÑandubaysal, GualeguaychúNaré Berduc
129776111/01/2020ArgentinaEntre RíosGualeguaychúMario Daniel Piccini
129577827/08/2019ArgentinaEntre RíosGualeguaychúMario Daniel Piccini
81035322/09/2018ArgentinaEntre RíosCerca de la Ciudad al norte, Gualeguaychú30Claudio Mendez
57885103/05/2017ArgentinaEntre RíosZona Puerta del Sol cerca del río Gualeguaychú., GualeguaychúRodolfo Julio Velazquez
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 11/04/2026.