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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 del Pilar

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
241163902/01/2026ArgentinaBuenos AiresReserva Natural del Pilar2Franco Montaño Herrero
241350517/12/2025ArgentinaBuenos AiresReserva Natural del Pilar3Gabriel Carbajales
238592415/11/202511:56ArgentinaBuenos AiresDoctor Manuel Argerich 15, Reserva Natural del Pilar1María Alejandra Sosa
238584715/11/202511:56ArgentinaBuenos AiresDoctor Manuel Argerich 15, Reserva Natural del Pilar1Jorge La Grotteria
163637208/09/2022ArgentinaBuenos AiresReserva Natural del Pilar1Gabriel Carbajales
158913514/05/2022ArgentinaBuenos AiresReserva Natural del PilarSebastián Fornés
146292117/09/2021ArgentinaBuenos AiresReserva Natural del Pilar3Gabriel Carbajales
143884801/08/2021ArgentinaBuenos AiresReserva Natural del PilarAlec Earnshaw
144619411/07/2021ArgentinaBuenos AiresReserva Natural del Pilar3Eugenia Boggiano
129763510/10/2020ArgentinaBuenos AiresReserva Natural del Pilar2Diego Oscar
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.