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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 Baradero

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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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
167387405/11/2022ArgentinaBuenos AiresBaraderoRodolfo Seró
131097414/11/2020ArgentinaBuenos AiresBaraderoRodolfo Seró
130795507/11/2020ArgentinaBuenos AiresAlsina, BaraderoRodolfo Seró
119032809/02/2020ArgentinaBuenos AiresBarrancas de Baradero, Baradero1Sebastián Otero
62810416/10/2017ArgentinaBuenos AiresEntrada A Baradero,ruta 41, Baradero3Juan Cruz Mena
59567228/07/2017ArgentinaBuenos AiresRuta 41,entre Villa Lia y Santa Coloma, Baradero5Juan Cruz Mena
56416825/03/2017ArgentinaBuenos AiresCamping Municipal, BaraderoPaloma Borghello
37711920/12/2015ArgentinaBuenos AiresBaraderoJorge La Grotteria
37316929/11/2015ArgentinaBuenos AiresBañado y campo de Bini, BaraderoEugenia Boggiano
36886729/11/2015ArgentinaBuenos AiresBarrancas de Baradero, BaraderoVirginia Bonifacio
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 12/04/2026.