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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 Formosa

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: 526947
  Adult

Formosa
Formosa
Argentina
11/29/2022
José Luis Ianiro



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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
212092221/07/2024ArgentinaFormosaHerradura, Formosa3Bc_pajareritos Agriornis
211627420/07/2024ArgentinaFormosaCamino A Cañada 12, Formosa5Bc_pajareritos Agriornis
211287117/07/2024ArgentinaFormosaFormosa Golf Club, Formosa4Bc_pajareritos Agriornis
188164109/09/2023ArgentinaFormosaMi Casa, Formosa14Fabricio Candia
188165821/08/2023ArgentinaFormosaReserva de Biósfera Laguna Oca, Formosa2Fabricio Candia
188160814/05/2023ArgentinaFormosaCamino a Don Julián, Formosa6Fabricio Candia
188163313/05/2023ArgentinaFormosaFormosa--Paseo Costanero, Formosa4Fabricio Candia
188160902/04/2023ArgentinaFormosaCamino a Laguna Oca, Formosa1Fabricio Candia
188165721/12/2022ArgentinaFormosaReserva de Biósfera Laguna Oca, Formosa1Fabricio Candia
173166929/11/2022ArgentinaFormosaCostanera de Formosa, FormosaJosé Luis Ianiro
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 15/04/2026.