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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: 462112
  Adult

Santo Tomé
Santa Fe
Argentina
10/12/2015
Eduardo Beltrocco
Foto
Photography ID: 462108
  Adult

Santo Tomé
Santa Fe
Argentina
09/29/2015
Eduardo Beltrocco
Foto
Photography ID: 462104
  Adult

Santo Tomé
Santa Fe
Argentina
09/30/2015
Eduardo Beltrocco
Foto
Photography ID: 414411
  Adult

San Miguel del Monte
Buenos Aires
Argentina
09/19/2015
Vicente Piccirillo
Foto
Photography ID: 403081
  Adult

Lanús
Buenos Aires
Argentina
08/03/2015
Vicente Piccirillo
Foto
Photography ID: 296380
  Adult

Burzaco
Buenos Aires
Argentina
08/12/2015
Victor Ferg
Foto
Photography ID: 238781
  Adult

Reserva El Bagual
Formosa
Argentina
09/30/2015
Vicente Piccirillo
Foto
Photography ID: 235383
  Adult

Tres Lomas
Buenos Aires
Argentina
03/26/2015
Zulima América Schupbach
Foto
Photography ID: 235369
  Adult

Tres Lomas
Buenos Aires
Argentina
03/26/2015
Zulima América Schupbach
Foto
Photography ID: 228175
  Adult

Humahuaca
Jujuy
Argentina
05/10/2015
Christian Altamirano



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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
39349531/12/2015ArgentinaSanta FeRosarioElisabet Giusti
38292731/12/2015ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)Nicolas Olejnik
38275031/12/2015ArgentinaChubutTrelewMarcelo Funes
38636630/12/2015ArgentinaSantiago del EsteroSierras de GuasayánJose Luis Navarro
38242530/12/2015ArgentinaCórdobaParque Provincial ChancaníSebastián Dardanelli
38605329/12/2015ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)Federico Andrés De Maio
38457629/12/2015ArgentinaRío NegroAntigua Ruta 3 (entre Viedma y San Javier), ViedmaLisandro Osorio
38293529/12/2015ArgentinaCórdobaSeccion Isla, Villa Los AromosAndres Espindola
38259029/12/2015ArgentinaCórdobaCura BrocheroSebastián Dardanelli
38253629/12/2015ArgentinaCórdobaCamino de los TúnelesSebastián Dardanelli
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 24/09/2026.