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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 Colón

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: 505459
  Adult

Colón
Entre Ríos
Argentina
08/28/2022
Tramannoni Ariel
Foto
Photography ID: 128312
  Adult

Colón
Entre Ríos
Argentina
12/07/2015
Román Montero



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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
225802631/01/2025ArgentinaEntre RíosColonia Ensanche Sauce, Colón1Pablo Eguia
212032120/07/2024ArgentinaEntre RíosTerminal de Omnibus, Colón55Bc_pajareritos Aguila Pescadora
212032020/07/2024ArgentinaEntre RíosTerminal de Omnibus, Colón55Felipe Aguilar
205370809/06/2024ArgentinaEntre RíosCam. Tiempo Libre, Colón10Felipe Aguilar
205370729/02/2024ArgentinaEntre RíosCam. Tiempo Libre, Colón13Felipe Aguilar
205370621/01/2024ArgentinaEntre RíosCalzada de Cateloti oeste, Colón2Felipe Aguilar
205371017/01/2024ArgentinaEntre RíosCamino Rural Bernardo Blanc, Colón5Felipe Aguilar
205370921/10/2023ArgentinaEntre RíosCamino Rural Bernardo Blanc, Colón2Felipe Aguilar
205371330/09/2023ArgentinaEntre RíosLaguna Km 8, Colón7Felipe Aguilar
205371124/09/2023ArgentinaEntre RíosCamino Vecinal, Colón2Felipe Aguilar
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 10/04/2026.