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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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Records from Puerto Iguazú

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: 666750
♂ ♀
  Adult

Puerto Iguazú
Misiones
Argentina
09/21/2013
Eugenia Boggiano
Foto
Photography ID: 511461
  Adult

Puerto Iguazú
Misiones
Argentina
10/11/2022
Silvia Sokolovsky
Foto
Photography ID: 486762
  Adult

Puerto Iguazú
Misiones
Argentina
03/18/2022
Franco Damiani
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: 367439
 

Puerto Iguazú
Misiones
Argentina
10/13/2016
Lotfi Si Saber
Foto
Photography ID: 329402
  Adult

Puerto Iguazú
Misiones
Argentina
04/10/2019
Eduardo Jorge Cavalcante Vieira
Foto
Photography ID: 309184
  Adult

Puerto Iguazú
Misiones
Argentina
09/23/2018
Victor Hugo Michelini
Foto
Photography ID: 297161
  Adult

Puerto Iguazú
Misiones
Argentina
10/15/2018
Gustavo Fernando Durán
Foto
Photography ID: 289805
  Adult

Puerto Iguazú
Misiones
Argentina
10/01/2018
Pablo Capovilla
Foto
Photography ID: 286033
  Adult

Puerto Iguazú
Misiones
Argentina
08/28/2018
Maria Victoria Di Stasio
Foto
Photography ID: 270074
  Adult

Puerto Iguazú
Misiones
Argentina
06/05/2018
Victoria Herrera



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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
237669020/10/202507:46ArgentinaMisionesUruguay 592, Puerto Iguazú2Gustavo Fernando Durán
236767209/09/2025ArgentinaMisionesObservatorio de Aves Daniel Pupi Somay, Puerto IguazúAdrian Braidotti
234968928/07/2025ArgentinaMisionesSelva Iryapú (600 hectáreas), Puerto Iguazú2Diego Oscar
219995022/11/2024ArgentinaMisionesPuerto Iguazu, Puerto Iguazú2Hugo Caverzasi
217208812/10/2024ArgentinaMisionesComplejo Americano, Puerto Iguazú1Pablo Bruni
217206812/10/2024ArgentinaMisionesJardín de los Picaflores, Puerto Iguazú1Pablo Bruni
217161712/10/2024ArgentinaMisionesComplejo Americano, Puerto Iguazú1Faustino Hollmann
217159712/10/2024ArgentinaMisionesJardín de los Picaflores, Puerto Iguazú1Faustino Hollmann
221032803/10/2024ArgentinaMisionesHito Tres Fronteras, Puerto Iguazú2Enrique Chiurla
220836803/10/2024ArgentinaMisionesHito Tres Fronteras, Puerto Iguazú2Victor Hugo Michelini
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 19/04/2026.