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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 Mar del Plata

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: 646183
  Adult

Mar del Plata
Buenos Aires
Argentina
06/07/2025
José Luis Ianiro
Foto
Photography ID: 624618
  Adult

Mar del Plata
Buenos Aires
Argentina
11/30/2024
José Luis Ianiro
Foto
Photography ID: 591747
  Adult

Mar del Plata
Buenos Aires
Argentina
07/16/2024
Bc_pajareritos Dormilonas
Foto
Photography ID: 540432
  Adult

Mar del Plata
Buenos Aires
Argentina
05/13/2023
José Luis Ianiro
Foto
Photography ID: 473961
  Adult

Mar del Plata
Buenos Aires
Argentina
12/05/2021
José Luis Ianiro
Foto
Photography ID: 473940
  Adult

Mar del Plata
Buenos Aires
Argentina
12/05/2021
José Luis Ianiro
Foto
Photography ID: 472423
  Adult

Mar del Plata
Buenos Aires
Argentina
08/29/2021
José Luis Ianiro
Foto
Photography ID: 459625
  Adult

Mar del Plata
Buenos Aires
Argentina
08/28/2021
Juan Manuel Canepa
Foto
Photography ID: 443204
♂ ♀
  Adult

Mar del Plata
Buenos Aires
Argentina
05/01/2021
José Luis Ianiro
Foto
Photography ID: 438604
  Adult

Mar del Plata
Buenos Aires
Argentina
02/09/2021
José Luis Ianiro
Foto
Photography ID: 422016
  Adult

Mar del Plata
Buenos Aires
Argentina
11/28/2020
Victor Hugo Michelini
Foto
Photography ID: 421575
  Adult

Mar del Plata
Buenos Aires
Argentina
11/22/2020
Victor Hugo Michelini



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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
244809014/03/2026ArgentinaBuenos AiresCamino Rural 045-06 inters 045-09, Mar del Plata9Enrique Chiurla
244798214/03/2026ArgentinaBuenos AiresCamino Rural 045-06 inters 045-09, Mar del Plata9Victor Hugo Michelini
243872414/02/2026ArgentinaBuenos AiresChapadmalal, Mar del Plata4Victor Hugo Michelini
234930630/08/202516:24ArgentinaBuenos AiresMatheu 1851, Mar del Plata1Nicolas Olejnik
233197107/06/2025ArgentinaBuenos AiresReserva Natural Paititi, Mar del PlataJosé Luis Ianiro
225657101/03/2025ArgentinaBuenos AiresPuerto, Mar del Plata1Claudio Ruben Rodriguez
225651701/03/2025ArgentinaBuenos AiresPuerto, Mar del Plata1Victor Hugo Michelini
225036430/01/2025ArgentinaBuenos AiresBatan, Mar del Plata21Victor Hugo Michelini
225581430/11/2024ArgentinaBuenos AiresLagunas de Punta Mogotes, Mar del Plata22José Luis Ianiro
222983818/11/2024ArgentinaBuenos AiresAlrededores de Sierra de los Padres, Mar del Plata5Enrique Chiurla
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 12/04/2026.