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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: 690379
♀
  Adult

Jardin
Antioquia
Colombia
05/16/2026
Victor Hugo Michelini
Foto
Photography ID: 671266
♀
  Adult

Estacion Chapadmalal
Buenos Aires
Argentina
01/25/2026
Victor Hugo Michelini
Foto
Photography ID: 669569
♂
  Adult

Estancia Nahuel Ruca
Buenos Aires
Argentina
01/10/2026
Victor Hugo Michelini
Foto
Photography ID: 575805
♀
  Adult

Estancia Nahuel Ruca
Buenos Aires
Argentina
02/13/2024
Victor Hugo Michelini
Foto
Photography ID: 473761
♂
  Adult

Parque Nacional Calilegua
Jujuy
Argentina
11/01/2021
Victor Hugo Michelini
Foto
Photography ID: 471966
♂
  Adult

Salta (Capital)
Salta
Argentina
10/29/2021
Victor Hugo Michelini
Foto
Photography ID: 471399
♂
  Adult

Quebrada del Toro
Salta
Argentina
10/28/2021
Victor Hugo Michelini



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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
253792123/09/2026ArgentinaMendozaCañon del Atuel, San Rafael10Victor Hugo Michelini
253669622/09/2026ArgentinaMendozaSan Rafael11Victor Hugo Michelini
250810404/08/2026ArgentinaBuenos AiresReserva Natural del Puerto, Mar del Plata10Victor Hugo Michelini
247945316/05/2026ColombiaAntioquiaReserva Los Guacharos, Jardin9Victor Hugo Michelini
249859314/05/2026ColombiaBogotáJardín Botánico, Bogotá6Victor Hugo Michelini
245454824/03/2026ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata4Victor Hugo Michelini
244798214/03/2026ArgentinaBuenos AiresCamino Rural 045-06 inters 045-09, Mar del Plata9Victor Hugo Michelini
243723816/02/2026ArgentinaBuenos AiresEstancia Nahuel Rucá, Albúfera Laguna Mar Chiquita8Victor Hugo Michelini
243872414/02/2026ArgentinaBuenos AiresChapadmalal, Mar del Plata4Victor Hugo Michelini
243375931/01/2026ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita13Victor Hugo Michelini
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.