Don't want to see ads? Sign up...




Molothrus bonariensis

Shiny Cowbird


Molothrus bonariensis

(Gmelin, JF, 1789)
Tordo Renegrido
Chupim

Family: Icteridae
Order: Passeriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

 Request change




Filters



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





Geographic distribution


Loading map...




Species photographs

Last published photographs



 Add a photography of this species






Species vocalizations

Last vocalizations published



 Add an audio of this species





Species videos

Last filmings published




 Add a film of this species





Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
64093414/11/2017ArgentinaBuenos AiresCamino a Reserva el Destino y Reserva El Destino, MagdalenaPaloma Borghello
59587729/07/2017ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)Paloma Borghello
56416825/03/2017ArgentinaBuenos AiresCamping Municipal, BaraderoPaloma Borghello
57304823/02/2017ArgentinaBuenos AiresPunta Lara - Camping Bahía, EnsenadaPaloma Borghello
56489414/02/2017ArgentinaBuenos AiresJáuregui, LujánPaloma Borghello
55771408/11/2015ArgentinaCorrientesLaguna IberáPaloma Borghello
22749614/01/2015ArgentinaEntre RíosParque Nacional Pre-DeltaPaloma Borghello
22326529/12/2014ArgentinaBuenos AiresReserva Natural Puerto Mar del PlataPaloma Borghello
21240823/12/2014ArgentinaCiudad Autónoma de Buenos AiresReserva Ecológica Costanera Sur (RECS)Paloma Borghello
Page 1

 Add a record of this species

📖
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 30/09/2026.