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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: 601574
  Adult

Federación
Entre Ríos
Argentina
07/30/2011
Adrian Braidotti
Foto
Photography ID: 601573
  Adult

Federación
Entre Ríos
Argentina
07/30/2011
Adrian Braidotti
Foto
Photography ID: 223529
  Adult

Federación
Entre Ríos
Argentina
09/24/2017
Victoria Herrera
Foto
Photography ID: 108603
  Adult

Federación
Entre Ríos
Argentina
07/21/2015
Diego Trillo
Foto
Photography ID: 8321
  Adult

Federación
Entre Ríos
Argentina
07/30/2011
Adrian Braidotti



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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
199902001/04/2023ArgentinaEntre RíosLos Conquistadores, Federación2Naré Berduc
170216514/01/2023ArgentinaEntre RíosAvenida las Violetas 155, FederaciónSantiago Juan Torres
170177214/01/2023ArgentinaEntre RíosAvenida las Violetas 155, FederaciónSantiago Juan Torres
199902128/10/2022ArgentinaEntre RíosReserva forestal Chaviyú, Federación2Naré Berduc
129713406/10/2020ArgentinaEntre RíosReserva forestal Chaviyú, Federación1Patricia Beatriz Benitez
126137512/10/2019ArgentinaEntre RíosFederacion, Federación12Gabriel Carbajales
62885124/09/2017ArgentinaEntre RíosParque municipal y reserva forestal "el Aromito" (-30.9866186636 -57.9125189781), FederaciónVictoria Herrera
37224303/12/2015ArgentinaEntre RíosZona entre Terminal y Complejo Termal, Federación1Carlos M. Grassini
36209329/10/2015ArgentinaEntre RíosParque municipal y reserva forestal , Federación10Carlos M. Grassini
31242821/07/2015ArgentinaEntre RíosFederaciónDiego Trillo
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 12/04/2026.