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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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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: 601572
♂ ♀
  Adult

Santiago de chile
Región Metropolitana
Chile
06/24/2018
Adrian Braidotti
Foto
Photography ID: 540879
  Adult

Capilla del Monte
Córdoba
Argentina
09/16/2018
Martín Lépez
Foto
Photography ID: 491377
  Fledgling

Santo Tomé
Santa Fe
Argentina
10/27/2018
Eduardo Beltrocco
Foto
Photography ID: 491349
  Adult

Santo Tomé
Santa Fe
Argentina
10/15/2018
Eduardo Beltrocco
Foto
Photography ID: 491313
  Adult

Santo Tomé
Santa Fe
Argentina
09/14/2018
Eduardo Beltrocco
Foto
Photography ID: 490333
♂ ♀
  Adult

Santo Tomé
Santa Fe
Argentina
09/13/2018
Eduardo Beltrocco
Foto
Photography ID: 490307
  Adult

Santo Tomé
Santa Fe
Argentina
08/30/2018
Eduardo Beltrocco
Foto
Photography ID: 482961
  Adult

Ensenada
Buenos Aires
Argentina
11/03/2018
Walter Omar Buffarini
Foto
Photography ID: 417059
  Adult

General Viamonte
Córdoba
Argentina
09/25/2018
Green Sergio Rodrigo
Foto
Photography ID: 416186
  Fledgling

Bahía Blanca
Buenos Aires
Argentina
02/11/2018
Fernando Naifleisch
Foto
Photography ID: 415436
  Adult

Concordia
Entre Ríos
Argentina
08/17/2018
María Alejandra Sosa
Foto
Photography ID: 409061
  Adult

Cuesta del Clavillo
Tucumán
Argentina
12/08/2018
Glauco Oliveira



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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
109013931/12/2018ArgentinaMisionesSanta Rosa, Capital10Julian Quillen Vidoz
86349331/12/2018UruguayMaldonadoPunta del Este2Diego Oscar
86347431/12/2018UruguayMaldonadoArroyo Jose Ignacio1Diego Oscar
86327431/12/2018ArgentinaSanta FeBañado laguna setubal, Santa FeRodolfo Seró
86231531/12/2018ArgentinaBuenos AiresMaipu, MaipúEsteban Argerich
86221331/12/2018ArgentinaCórdobaVilla Edén, La FaldaWalter Bustamante
86186731/12/2018ArgentinaBuenos AiresRuta sin nombrarSantiago Juan Torres
188165130/12/2018ArgentinaFormosaReserva de Biósfera Laguna Oca, Formosa3Fabricio Candia
122733030/12/2018ArgentinaEntre RíosÁrea Natural Protegida Don Sebastián1Luis Prevedel
86444430/12/2018ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 11/04/2026.