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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 Villa de Merlo

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: 559943
♂ ♀
  Adult

Villa de Merlo
San Luis
Argentina
01/20/2016
Damián Carnevale
Foto
Photography ID: 541434
  Adult

Villa de Merlo
San Luis
Argentina
11/11/2012
Martín Lépez
Foto
Photography ID: 507810
  Adult

Villa de Merlo
San Luis
Argentina
09/03/2022
Diego Alfonso Rosa
Foto
Photography ID: 394559
  Adult

Villa de Merlo
San Luis
Argentina
09/29/2019
Juan Benjamin Celli
Foto
Photography ID: 393210
  Adult

Villa de Merlo
San Luis
Argentina
10/12/2019
Guillermo C Olivero
Foto
Photography ID: 393017
  Adult

Villa de Merlo
San Luis
Argentina
10/11/2019
Guillermo C Olivero
Foto
Photography ID: 384737
  Adult

Villa de Merlo
San Luis
Argentina
02/09/2020
Feliciano Ferretti
Foto
Photography ID: 355704
♂ ♀
  Adult

Villa de Merlo
San Luis
Argentina
02/02/2019
Daniel Osvaldo Fernández
Foto
Photography ID: 343753
  Adult

Villa de Merlo
San Luis
Argentina
07/18/2019
Pablo Eguia
Foto
Photography ID: 170366
  Adult

Villa de Merlo
San Luis
Argentina
01/30/2015
Rodolfo Julio Velazquez
Foto
Photography ID: 137206
  Adult

Villa de Merlo
San Luis
Argentina
01/30/2016
Victoria Herrera
Foto
Photography ID: 130882
  Adult

Villa de Merlo
San Luis
Argentina
12/20/2015
Eugenia Boggiano



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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
197685606/02/2024ArgentinaSan LuisCerro de oro, Villa de Merlo3Rodolfo Domnanovich
197681905/02/2024ArgentinaSan LuisCerro de oro, Villa de Merlo4Rodolfo Domnanovich
197677304/02/2024ArgentinaSan LuisCerro de oro, Villa de Merlo8Rodolfo Domnanovich
197675603/02/2024ArgentinaSan LuisCerro de oro, Villa de Merlo5Rodolfo Domnanovich
188574120/09/2023ArgentinaSan LuisCiudad - Calle Cerro Azul, Villa de Merlo5Carlos Enrique Alvarez
164906124/09/2022ArgentinaSan LuisReserva Florofaunistica de Rincon del Este, Villa de Merlo2Julián Tocce
164025003/09/2022ArgentinaSan LuisReserva Florofaunistica de Rincon del Este, Villa de MerloDiego Alfonso Rosa
147311707/09/2021ArgentinaSan LuisVilla de Merlo, Villa de MerloElsa Longo
119137412/02/2020ArgentinaSan LuisVilla de MerloLeonardo Caballero
120181309/02/2020ArgentinaSan LuisMerlo y alrededores, Villa de MerloFeliciano Ferretti
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.