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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 Mar Chiquita

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: 610125
  Adult

Mar Chiquita
Buenos Aires
Argentina
09/03/2024
José Luis Ianiro
Foto
Photography ID: 598985
  Adult

Mar Chiquita
Buenos Aires
Argentina
09/08/2024
Celina Emilia Iratchet
Foto
Photography ID: 553855
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/14/2023
José Luis Ianiro
Foto
Photography ID: 540781
  Adult

Mar Chiquita
Buenos Aires
Argentina
07/01/2023
José Luis Ianiro
Foto
Photography ID: 513246
♂ ♀
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/28/2022
Eduardo Cusano
Foto
Photography ID: 478642
  Adult

Mar Chiquita
Buenos Aires
Argentina
01/08/2022
Luis Carlos De Volder
Foto
Photography ID: 473005
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/10/2021
José Luis Ianiro
Foto
Photography ID: 473003
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/10/2021
José Luis Ianiro
Foto
Photography ID: 472575
  Adult

Mar Chiquita
Buenos Aires
Argentina
09/13/2021
José Luis Ianiro
Foto
Photography ID: 370814
  Adult

Mar Chiquita
Buenos Aires
Argentina
01/19/2019
M Carolina Lago
Foto
Photography ID: 366354
  Adult

Mar Chiquita
Buenos Aires
Argentina
12/01/2019
José Luis Ianiro
Foto
Photography ID: 232866
  Adult

Mar Chiquita
Buenos Aires
Argentina
12/09/2017
Hernán Tolosa



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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
245829920/03/2026ArgentinaBuenos AiresLaguna Nahuel Ruca, Mar Chiquita2Enrique Chiurla
243375931/01/2026ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita13Victor Hugo Michelini
242817127/01/2026ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita20Victor Hugo Michelini
240811628/12/2025ArgentinaBuenos AiresMar Chiquita3Victor Hugo Michelini
238658709/11/2025ArgentinaBuenos AiresMar Chiquita4Victor Hugo Michelini
238349801/11/2025ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita3Victor Hugo Michelini
238009118/10/2025ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita6Victor Hugo Michelini
237801104/10/2025ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita23Victor Hugo Michelini
230889707/06/2025ArgentinaBuenos AiresLaguna Nahuel Ruca, Mar Chiquita7Victor Hugo Michelini
229521918/02/2025ArgentinaBuenos AiresCelpa, Mar Chiquita1Enrique Chiurla
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 19/04/2026.