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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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Latest feeding records

Feeding on...
GroupSpeciesDateUser
PlantsEchinochloa sp.27/11/2017Eduardo Beltrocco




Species photographs

Last published photographs

Foto
Photography ID: 491377
  Fledgling

Santo Tomé
Santa Fe
Argentina
10/27/2018
Eduardo Beltrocco
Foto
Photography ID: 491349
♀
  Adult

Santo Tomé
Santa Fe
Argentina
10/15/2018
Eduardo Beltrocco
Foto
Photography ID: 491313
♂
  Adult

Santo Tomé
Santa Fe
Argentina
09/14/2018
Eduardo Beltrocco
Foto
Photography ID: 490333
♂ ♀
  Adult

Santo Tomé
Santa Fe
Argentina
09/13/2018
Eduardo Beltrocco
Foto
Photography ID: 490307
♂
  Adult

Santo Tomé
Santa Fe
Argentina
08/30/2018
Eduardo Beltrocco
Foto
Photography ID: 465000
♀
  Adult

Santo Tomé
Santa Fe
Argentina
09/28/2021
Eduardo Beltrocco
Foto
Photography ID: 463475
♀
  Adult

Santo Tomé
Santa Fe
Argentina
06/10/2017
Eduardo Beltrocco
Foto
Photography ID: 462958
♀
  Adult

Santo Tomé
Santa Fe
Argentina
12/15/2017
Eduardo Beltrocco
Foto
Photography ID: 462885
  Fledgling

Santo Tomé
Santa Fe
Argentina
11/29/2017
Eduardo Beltrocco
Foto
Photography ID: 462876
  Fledgling

Santo Tomé
Santa Fe
Argentina
11/27/2017
Eduardo Beltrocco
Foto
Photography ID: 462611
♂
  Adult

Santo Tomé
Santa Fe
Argentina
09/11/2017
Eduardo Beltrocco
Foto
Photography ID: 462112
♂
  Adult

Santo Tomé
Santa Fe
Argentina
10/12/2015
Eduardo Beltrocco



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Species vocalizations

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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
163997918/09/2022ArgentinaSanta FeSarmiento y Centenario, Santo Tomé6Eduardo Beltrocco
163420704/09/2022ArgentinaSanta FeSarmiento y Centenario, Santo Tomé1Eduardo Beltrocco
155614011/03/2022ArgentinaSanta FePlaza Los Constituyentes, Santa FeEduardo Beltrocco
151617617/12/2021ArgentinaSanta FeReserva Natural Urbana del Oeste, Santa FeEduardo Beltrocco
147950314/10/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
147334607/10/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
147277802/10/2021ArgentinaSanta FeCosta Dorada, Santo ToméEduardo Beltrocco
147289428/09/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
146667424/09/2021ArgentinaSanta FePlaza Libertad, Santo ToméEduardo Beltrocco
146669823/09/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
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 01/10/2026.