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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 Reserva Natural Paititi

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: 412284
  Adult

Reserva Natural Paititi
Buenos Aires
Argentina
09/21/2020
José Luis Ianiro
Foto
Photography ID: 364819
  Adult

Reserva Natural Paititi
Buenos Aires
Argentina
11/24/2019
José Luis Ianiro



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
135828124/01/2021ArgentinaBuenos AiresReserva Natural Paititi5Victor Hugo Michelini
134236509/12/2020ArgentinaBuenos AiresReserva Natural PaititiHernán Tolosa
132159423/11/2020ArgentinaBuenos AiresReserva Natural Paititi17José Luis Ianiro
129617026/09/2020ArgentinaBuenos AiresReserva Natural PaititiVictor Hugo Michelini
129412426/09/2020ArgentinaBuenos AiresReserva Natural Paititi15José Luis Ianiro
129332521/09/2020ArgentinaBuenos AiresReserva Natural Paititi12José Luis Ianiro
119962315/02/2020ArgentinaBuenos AiresReserva Natural Paititi4José Luis Ianiro
116699411/01/2020ArgentinaBuenos AiresReserva Natural Paititi15José Luis Ianiro
114846707/12/2019ArgentinaBuenos AiresReserva Natural PaititiVictor Hugo Michelini
113839124/11/2019ArgentinaBuenos AiresReserva Natural Paititi35José 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 06/04/2026.