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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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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

Last published photographs

Foto
Photography ID: 412673
♂ ♀
 
Santa Fe
Santa Fe
Argentina
09/25/2020
Gustavo Fernando Durán
Foto
Photography ID: 412395
♂
 

Santa Fe
Santa Fe
Argentina
09/22/2020
Gustavo Fernando Durán
Foto
Photography ID: 297161
♂
  Adult

Puerto Iguazú
Misiones
Argentina
10/15/2018
Gustavo Fernando Durán
Foto
Photography ID: 251214
♀
  Adult

San Jerónimo Norte
Santa Fe
Argentina
01/07/2018
Gustavo Fernando Durán
Foto
Photography ID: 214355
♂
  Adult

San Jerónimo Norte
Santa Fe
Argentina
08/13/2017
Gustavo Fernando Durán
Foto
Photography ID: 185184
♂
  Adult

San Jerónimo Norte
Santa Fe
Argentina
10/16/2016
Gustavo Fernando Durán
Foto
Photography ID: 129273
♂
  Adult

Cerro Champaquí
Córdoba
Argentina
11/28/2015
Gustavo Fernando Durán
Foto
Photography ID: 124087
♂
  Adult

Puerto Iguazú
Misiones
Argentina
10/29/2015
Gustavo Fernando Durán



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Species vocalizations

Last vocalizations published



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Species videos

Last filmings published


Video ID: 3657
♂ ♀
  Adult

San Jerónimo Norte
Santa Fe
Argentina
10/28/2018
Gustavo Fernando Durán



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Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
253799130/09/202608:05ArgentinaCiudad Autónoma de Buenos AiresAvenida Doctor Tristán Achával Rodríguez 1400, Reserva Ecológica Costanera Sur (RECS)1Gustavo Fernando Durán
253526727/09/202607:26ArgentinaSanta FeEduardo Tesaire3Gustavo Fernando Durán
253434526/09/202608:01ArgentinaSanta FeRaúl Tacca 640, Santa Fe de la Vera Cruz4Gustavo Fernando Durán
252989920/09/202616:59ArgentinaSanta FeAvenida Belgrano 996, San Jerónimo Norte4Gustavo Fernando Durán
252907719/09/202608:04ArgentinaSanta Fe1º de Mayo 2401, Santa Fe de la Vera Cruz2Gustavo Fernando Durán
252806816/09/202615:57ArgentinaSanta FeRuta Nacional 168 80, Santa Fe de la Vera Cruz2Gustavo Fernando Durán
252784315/09/202609:30ArgentinaSanta FeReserva Ecológica Ciudad Universitaria UNL (RECU), Santa Fe1Gustavo Fernando Durán
252559811/09/202608:30ArgentinaMisionesCardenal 12, Puerto Iguazú1Gustavo Fernando Durán
252206506/09/202611:40ArgentinaSanta FeRuta sin nombrar3Gustavo Fernando Durán
252194906/09/202607:48ArgentinaSanta FeMariano Moreno 1343, San Jerónimo Norte2Gustavo Fernando Durán
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 01/10/2026.