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Species icon
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 Esperanza

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: 444090
♂ ♀
  Adult

Esperanza
Santa Fe
Argentina
05/08/2021
Pablo Capovilla
Foto
Photography ID: 407400
  Adult

Esperanza
Santa Fe
Argentina
08/08/2020
Pablo Capovilla
Foto
Photography ID: 407398
♂ ♀
  Adult

Esperanza
Santa Fe
Argentina
08/08/2020
Pablo Capovilla
Foto
Photography ID: 351714
  Adult

Esperanza
Santa Fe
Argentina
09/18/2019
M. Soledad Zingerling
Foto
Photography ID: 350204
  Adult

Esperanza
Santa Fe
Argentina
09/13/2019
M. Soledad Zingerling
Foto
Photography ID: 346985
 

Esperanza
Santa Fe
Argentina
08/23/2019
Mauricio Schmithalter
Foto
Photography ID: 339729
  Adult

Esperanza
Santa Fe
Argentina
07/03/2019
Pablo Capovilla
Foto
Photography ID: 335108
♂ ♀
  Adult

Esperanza
Santa Fe
Argentina
05/25/2019
Mauricio Schmithalter
Foto
Photography ID: 62733
  Adult

Esperanza
Santa Fe
Argentina
09/22/2014
Pablo Capovilla
Foto
Photography ID: 22621
  Adult

Esperanza
Santa Fe
Argentina
05/28/2013
Pablo Capovilla
Foto
Photography ID: 21663
♂ ♀
  Adult

Esperanza
Santa Fe
Argentina
04/17/2013
Pablo Capovilla



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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
204925024/06/2024ArgentinaSanta FeCullen 1502-1600, Esperanza1Pablo Capovilla
194129407/01/2024ArgentinaSanta FeEsperanza8Pablo Capovilla
143878301/08/2021ArgentinaSanta FeRío Salado al norte de Esperanza, Esperanza12Calidris Esperanza
140126408/05/2021ArgentinaSanta FeCaminos rurales al Este de la ruta 6 , EsperanzaPablo Capovilla
131444123/11/2020ArgentinaSanta FeVilla Georgina, EsperanzaLeonardo Caballero
128248824/08/2020ArgentinaSanta FeCampo de los curas - al norte de la ciudad, EsperanzaPablo Capovilla
127921708/08/2020ArgentinaSanta FeParque de la agricultura, EsperanzaPablo Capovilla
126544625/06/2020ArgentinaSanta FeEstancia Media Luna (al norte de la ciudad), EsperanzaPablo Capovilla
124875814/06/2020ArgentinaSanta FeCampo de los curas - al norte de la ciudad, EsperanzaLeonardo Caballero
124843713/06/2020ArgentinaSanta FeCaminos rurales al Este de la ruta 6 , EsperanzaLeonardo Caballero
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 11/04/2026.