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Molothrus bonariensis

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





Geographic distribution


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Species photographs

Last published photographs

Foto
Photography ID: 414411
  Adult

San Miguel del Monte
Buenos Aires
Argentina
09/19/2015
Vicente Piccirillo
Foto
Photography ID: 409955
  Adult

Huerta grande
Córdoba
Argentina
01/17/2013
Vicente Piccirillo
Foto
Photography ID: 409940
  Adult

Huerta grande
Córdoba
Argentina
01/14/2013
Vicente Piccirillo
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: 405923
  Adult

Puerto Iguazú
Misiones
Argentina
09/21/2013
Vicente Piccirillo
Foto
Photography ID: 405879
  Adult

Puerto Iguazú
Misiones
Argentina
09/21/2013
Vicente Piccirillo
Foto
Photography ID: 403081
  Adult

Lanús
Buenos Aires
Argentina
08/03/2015
Vicente Piccirillo
Foto
Photography ID: 402587
  Adult

Colonia Carlos Pellegrini
Corrientes
Argentina
11/18/2018
Vicente Piccirillo
Foto
Photography ID: 402122
  Adult

Delta del Paraná
Buenos Aires
Argentina
10/06/2019
Vicente Piccirillo
Foto
Photography ID: 277766
  Adult

Presidencia Roque Saenz Peña
Chaco
Argentina
10/20/2012
Vicente Piccirillo



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Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
251756806/10/2019ArgentinaBuenos AiresSobrenatural Parana mini, Delta del ParanáVicente Piccirillo
126684318/11/2018ArgentinaCorrientesColonia Carlos PellegriniVicente Piccirillo
126665925/08/2018ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Lago LuganoVicente Piccirillo
56313102/10/2016ArgentinaChacoParaje La Armonia, Parque Nacional El ImpenetrableVicente Piccirillo
67234630/09/2015ArgentinaFormosaReserva El BagualVicente Piccirillo
129869319/09/2015ArgentinaBuenos AiresLaguna de Monte, San Miguel del MonteVicente Piccirillo
126801403/08/2015ArgentinaBuenos AiresRemedios de escalada, LanúsVicente Piccirillo
127984529/11/2014ArgentinaBuenos AiresPredio de la Universidad Nacional de Lanùs, LanúsVicente Piccirillo
69119729/11/2014ArgentinaCiudad Autónoma de Buenos AiresCiudad Autónoma de Buenos AiresVicente Piccirillo
128151113/10/2014ArgentinaEntre RíosSan GustavoVicente Piccirillo
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) – Species account. Accessed from www.ecoregistros.org on 14/09/2026.