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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 Santa Rosa

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: 344586
  Adult

Santa Rosa
La Pampa
Argentina
01/20/2019
Andrés Cecconi
Foto
Photography ID: 73684
 
Santa Rosa
La Pampa
Argentina
12/21/2014
Eduardo Schaab
Foto
Photography ID: 70350
  Adult

Santa Rosa
La Pampa
Argentina
08/09/2014
Federico Burgos Bauer



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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
170278114/01/2023ArgentinaLa PampaRuta Nacional 35, Santa Rosa1María Alejandra Sosa
170229514/01/2023ArgentinaLa PampaRuta Nacional 35, Santa Rosa1Jorge La Grotteria
167937326/11/2022ArgentinaLa PampaSanta RosaDolores Fernandez
175958110/10/2022ArgentinaLa PampaReserva La Malvina., Santa RosaNatalia Dufour
165851010/10/2022ArgentinaLa PampaReserva La Malvina., Santa RosaMariano Pastor Dolsan
165791210/10/2022ArgentinaLa PampaReserva La Malvina., Santa RosaMarcelo Fabio Dolsan
165764210/10/2022ArgentinaLa PampaReserva La Malvina., Santa RosaMaría Fernanda De Inunciaga
165732110/10/2022ArgentinaLa PampaReserva La Malvina., Santa RosaMauricio Secchi
159518027/03/2022ArgentinaLa Pampalaguna don tomás, Santa RosaDaniel Osvaldo Fernández
159472027/03/2022ArgentinaLa Pampalaguna don tomás, Santa RosaMauricio Secchi
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 22/03/2026.