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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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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: 604647
  Adult

Corrientes capital
Corrientes
Argentina
12/25/2014
Peter Vidana
Foto
Photography ID: 503735
  Adult

Parque Provincial Chancaní
Córdoba
Argentina
12/20/2014
Nino A. Grangetto
Foto
Photography ID: 408627
  Immature

San Gustavo
Entre Ríos
Argentina
10/13/2014
Vicente Piccirillo
Foto
Photography ID: 407749
  Adult

Lanús
Buenos Aires
Argentina
11/29/2014
Vicente Piccirillo
Foto
Photography ID: 310425
  Adult

Candonga
Córdoba
Argentina
03/20/2014
Manuel Godoy
Foto
Photography ID: 262480
  Juvenile

La Plata
Buenos Aires
Argentina
12/21/2014
Federico Silvestre
Foto
Photography ID: 206955
  Adult

Curuzú Cuatiá
Corrientes
Argentina
07/27/2014
Luis Orlando Krause
Foto
Photography ID: 205566
  Adult

General Alvear
Mendoza
Argentina
08/04/2014
Roberto J. Triguez
Foto
Photography ID: 201596
  Adult

Córdoba
Córdoba
Argentina
12/02/2014
Jorge Schlemmer
Foto
Photography ID: 201595
  Fledgling

Córdoba
Córdoba
Argentina
11/13/2014
Jorge Schlemmer



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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
22868431/12/2014ArgentinaSanta FeReserva Ecológica Ciudad Universitaria UNL (RECU), Santa FeGustavo Fernando Durán
21650031/12/2014ArgentinaCiudad Autónoma de Buenos AiresLago de RegatasDiego Carus
56187329/12/2014ArgentinaCórdobaLaguna del Plata, La ParaEnzo Rossi
22326529/12/2014ArgentinaBuenos AiresReserva Natural Puerto Mar del PlataPaloma Borghello
48243528/12/2014ArgentinaEntre RíosIslas LechiguanasRodolfo Julio Velazquez
21572628/12/2014ArgentinaBuenos AiresGobernador UdaondoHernán Tolosa
21533028/12/2014ArgentinaCórdobaVilla Los AromosAndres Espindola
21473128/12/2014ArgentinaBuenos AiresPunta IndioFacundo Quintela
21465228/12/2014ArgentinaBuenos AiresMagdalenaFacundo Quintela
22252027/12/2014ArgentinaBuenos AiresMarisolDaniel Chiesa
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 06/04/2026.