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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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Latest feeding records




Number of Photography: 3301




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Number of Recorded Vocalizations: 6



Audio playerUserDateCountryProvincePlaceSexLife stageIt was observedDetails
Eduardo Jorge Cavalcante Vieira03/26/2025BrazilAlagoasAabb MaceióMaceioAdultYesNo
Sebastián Otero08/08/2021ArgentinaEntre RíosRuta sin nombrarAdultYesNo
Santiago Sainz-trápaga11/09/2013ArgentinaChubutValle Inferior del Río Chubut (VIRCH)AdultYesNo
Jose Luis Merlo05/09/2009ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)AdultYesNo
Jose Luis Merlo08/14/2009ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)AdultNoNo
Jose Luis Merlo08/14/2009ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)AdultNoNo


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Number of Films: 13





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Number of Records: 18461



Page 1 of 1847
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
245970818/04/202608:27ArgentinaSanta Fe1º de Mayo 904, Santa Fe de la Vera Cruz6Gustavo Fernando Durán
245946913/04/2026ArgentinaBuenos AiresCamino E/ Saavedra y Monte de Lenny10Silvia Ana González
245943613/04/2026ArgentinaBuenos AiresAbra del Hinojo, Saavedra - Partido de Saavedra20Silvia Ana González
245840113/04/2026ArgentinaBuenos AiresCamino E/ Saavedra y Monte de Lenny10Diego Oscar
245836813/04/2026ArgentinaBuenos AiresAbra del Hinojo, Saavedra - Partido de Saavedra20Diego Oscar
245908612/04/2026UruguayTacuaremboCamino de la escuela26Gabriel Carbajales
245905012/04/2026UruguayTacuaremboEstablecimiento Bichadero, Tacuarembó3Gabriel Carbajales
245781412/04/2026ArgentinaCórdobaEl Rocío, Las VarillasHugo Caverzasi
245810211/04/2026ArgentinaLa RiojaReserva Natural Urbana Taku2Carlos De Biagi
245879710/04/2026UruguaySaltoRuta 2680Gabriel Carbajales
Page 1 of 1847

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 18/04/2026.