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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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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: 150875
  Adult

Ciudad de Mendoza
Mendoza
Argentina
05/22/2016
Valentín González Feltrup



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
201003809/03/2024ArgentinaMendozaEl carrizal, Embalse El Carrizal1Valentín González Feltrup
201018904/02/2024ArgentinaSan LuisReserva Natural Estricta Quebrada de las Higueritas2Valentín González Feltrup
201010003/02/2024ArgentinaSan LuisBelgrano1Valentín González Feltrup
177214920/05/2023ArgentinaBuenos AiresReserva Natural Punta Rasa2Valentín González Feltrup
177684610/05/2023ArgentinaMendozaReserva Natural Villavicencio4Valentín González Feltrup
177693225/03/2023ArgentinaMendozaEl Bermejo2Valentín González Feltrup
171792805/02/2023ArgentinaMendozaEmbalse El NihuilValentín González Feltrup
177709904/02/2023ArgentinaMendozaEmbalse El Nihuil, Embalse El Nihuil1Valentín González Feltrup
177716128/01/2023ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, Lavalle1Valentín González Feltrup
46961920/08/2016ArgentinaMendozaLaguna La Paloma, MaipúValentín González Feltrup
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 15/04/2026.