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Molothrus bonariensis

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 Puerto Mar del Plata

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
191362521/10/2023ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata4José Luis Ianiro
158346518/12/2021ArgentinaBuenos AiresMar del Plata, Reserva Natural Puerto Mar del Plata4José Luis Ianiro
132186929/11/2020ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata17José Luis Ianiro
131373021/11/2020ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata9José Luis Ianiro
128785610/09/2020ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata12José Luis Ianiro
65657309/10/2016ArgentinaBuenos AiresMar del Plata, Reserva Natural Puerto Mar del Plata12José Luis Ianiro
43554814/05/2016ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata2José Luis Ianiro
38352326/12/2015ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata16José Luis Ianiro
33399625/09/2015ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata18José Luis Ianiro
32744813/09/2015ArgentinaBuenos AiresReserva Natural Puerto Mar del Plata11José Luis Ianiro
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) – Species account. Accessed from www.ecoregistros.org on 10/10/2026.