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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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Records from Diamante

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

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Foto
Photography ID: 497915
♂
  Adult

Diamante
Entre Ríos
Argentina
06/21/2022
Gustavo Puente
Foto
Photography ID: 6177
 
Diamante
Entre Ríos
Argentina
04/13/2011
Jose Luis Merlo



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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
249171109/07/202609:27ArgentinaEntre RíosAvenida Presidente Néstor Kirchner 3105, Diamante1Gustavo Fernando Durán
228810913/05/2025ArgentinaEntre RíosPn Pre Delta- Sendero del Espinal, Diamante3Patricia Beatriz Benitez
199901510/07/2023ArgentinaEntre RíosMonte La Paloma, Diamante9Naré Berduc
199901719/06/2023ArgentinaEntre RíosPN Pre-Delta, Diamante1Naré Berduc
160171921/06/2022ArgentinaEntre RíosLas Cuevas, DiamanteGustavo Puente
199901622/05/2022ArgentinaEntre RíosPN Pre-Delta, Diamante4Naré Berduc
199901410/04/2022ArgentinaEntre RíosLas Cuevas, DiamanteNaré Berduc
209789618/12/2021ArgentinaEntre RíosPN Pre-Delta, Diamante3Nazareno Del Carlo
144573207/08/2021ArgentinaEntre RíosEchagüe 110, Diamante3Eugenia Boggiano
144257507/08/2021ArgentinaEntre RíosEchagüe 110, Diamante3Gabriel Carbajales
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 27/09/2026.