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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 Chajarí

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: 490580
  Adult

Chajarí
Entre Ríos
Argentina
03/14/2022
Julián Tocce
Foto
Photography ID: 124091
  Adult

Chajarí
Entre Ríos
Argentina
10/10/2015
Walter Bustamante
Foto
Photography ID: 80866
  Fledgling

Chajarí
Entre Ríos
Argentina
02/03/2015
Hugo Caprotti
Foto
Photography ID: 56468
♂ ♀
  Adult

Chajarí
Entre Ríos
Argentina
07/13/2014
Carlos M. Grassini
Foto
Photography ID: 47054
♂ ♀
  Adult

Chajarí
Entre Ríos
Argentina
03/27/2014
Carlos M. Grassini



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Last Filmings published


Video ID: 470
♂ ♀
  Adult

Chajarí
Entre Ríos
Argentina
12/15/2013
Carlos M. Grassini



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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
237665819/10/2025ArgentinaEntre RíosZona San Pedro, Chajarí5Pablo Bruni
232364320/07/2025ArgentinaEntre RíosZona San Pedro, Chajarí1Pablo Bruni
221924522/12/2024ArgentinaEntre RíosZona San Pedro, Chajarí5Pablo Bruni
215664122/09/2024ArgentinaEntre RíosCamping Chajarí, Chajarí2Pablo Bruni
202510421/04/2024ArgentinaEntre RíosComplejo Termal Chajarí y alrededores, Chajarí1Pablo Bruni
192409403/12/2023ArgentinaEntre RíosRuta Nacional 14 14, Chajarí1Jorge La Grotteria
192336503/12/2023ArgentinaEntre RíosRuta Nacional 14 14, Chajarí1María Alejandra Sosa
179049306/07/2023ArgentinaEntre Ríostermas Chajarí, ChajaríAdrian Braidotti
169370926/12/2022ArgentinaEntre RíosReserva mocoreta, Chajarí2Pablo Bruni
158221808/05/2022ArgentinaEntre RíosComplejo Termal Chajarí y alrededores, ChajaríAdrian Braidotti
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 19/04/2026.