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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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Records from Los Toldos

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: 117787
  Adult

Los Toldos
Buenos Aires
Argentina
09/18/2015
Diego Villalba
Foto
Photography ID: 103196
  Adult

Los Toldos
Buenos Aires
Argentina
09/28/2014
Diego Villalba
Foto
Photography ID: 101146
 
Los Toldos
Buenos Aires
Argentina
09/27/2014
Diego Villalba
Foto
Photography ID: 33206
  Adult

Los Toldos
Buenos Aires
Argentina
01/10/2014
Jorge Herce
Foto
Photography ID: 32435
  Adult

Los Toldos
Buenos Aires
Argentina
01/05/2014
Jorge Herce



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
252470706/09/2026ArgentinaBuenos AiresLos ToldosEsteban Argerich
34108318/09/2015ArgentinaBuenos AiresZona rural, Los ToldosDiego Villalba
29744628/09/2014ArgentinaBuenos AiresLos ToldosDiego Villalba
29087227/09/2014ArgentinaBuenos AiresZona urbana, Los ToldosDiego Villalba
9419210/01/2014ArgentinaBuenos AiresLos ToldosJorge Herce
9147805/01/2014ArgentinaBuenos AiresLaguna La Azotea, Los ToldosJorge Herce
617719/09/2010ArgentinaBuenos AiresLos ToldosDiego Oscar
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.