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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: 415436
♀
  Adult

Concordia
Entre Ríos
Argentina
08/17/2018
María Alejandra Sosa
Foto
Photography ID: 186997
♂
  Immature

Villa Paranacito
Entre Ríos
Argentina
01/23/2017
María Alejandra Sosa
Foto
Photography ID: 88866
  Juvenile

Concordia
Entre Ríos
Argentina
03/14/2015
María Alejandra Sosa
Foto
Photography ID: 76520
♀
  Adult

Concordia
Entre Ríos
Argentina
01/07/2015
María Alejandra Sosa



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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
253619627/09/202616:10ArgentinaEntre RíosParque Nacional El Palmar1María Alejandra Sosa
253606127/09/202615:09ArgentinaEntre RíosLas Dalias 63, Ubajay1María Alejandra Sosa
253423822/09/202618:19ArgentinaEntre RíosLago Salto Grande, Concordia2María Alejandra Sosa
252939519/09/202612:36ArgentinaEntre RíosRuta Nacional 126María Alejandra Sosa
252102003/09/202617:40ArgentinaMisionesParaguay 546, Puerto Iguazú1María Alejandra Sosa
252069202/09/202618:12ArgentinaMisionesParaguay 546, Puerto Iguazú1María Alejandra Sosa
252003001/09/202611:41ArgentinaMisionesJardín de los Picaflores, Puerto Iguazú1María Alejandra Sosa
251856030/08/202613:23ArgentinaMisionesRuta Nacional 12 4, Puerto Iguazú2María Alejandra Sosa
251864129/08/202618:21ArgentinaMisionesAvenida Victoria Aguirre 638, Puerto Iguazú1María Alejandra Sosa
251362520/08/202618:06ArgentinaMisionesAvenida Río Iguazú 2640, Puerto Iguazú1María Alejandra Sosa
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.