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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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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


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Species photographs

Last published photographs

Foto
Photography ID: 56468
♂ ♀
  Adult

Chajarí
Entre Ríos
Argentina
07/13/2014
Carlos M. Grassini
Foto
Photography ID: 47054
♂ ♀
  Adult

Chajarí
Entre Ríos
Argentina
03/27/2014
Carlos M. Grassini



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Species vocalizations

Last vocalizations published



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Species videos

Last filmings published


Video ID: 470
♂ ♀
  Adult

Chajarí
Entre Ríos
Argentina
12/15/2013
Carlos M. Grassini



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Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
60715830/08/2017ArgentinaCorrientesReserva Mocoretá, Mocoretá20Carlos M. Grassini
60522813/07/2017ArgentinaEntre RíosUrquiza y Sáenz Peña, Chajarí50Carlos M. Grassini
58075007/06/2017ArgentinaEntre RíosUrquiza y Sáenz Peña, Chajarí30Carlos M. Grassini
51740618/12/2016ArgentinaEntre RíosCalle Siburu entre Udine y Av. V. Libertad (30°44, Chajarí8Carlos M. Grassini
42237403/04/2016ArgentinaEntre RíosUrquiza y Sáenz Peña, Chajarí50Carlos M. Grassini
39192622/01/2016ArgentinaEntre RíosUrquiza y Sáenz Peña, Chajarí7Carlos M. Grassini
37224303/12/2015ArgentinaEntre RíosZona entre Terminal y Complejo Termal, Federación1Carlos M. Grassini
35893701/11/2015ArgentinaEntre RíosCalle Siburu entre Udine y Av. V. Libertad (30°44"49.85"s; 58° 0"11.77"o), Chajarí10Carlos M. Grassini
36209329/10/2015ArgentinaEntre RíosParque municipal y reserva forestal , Federación10Carlos M. Grassini
34938218/10/2015ArgentinaEntre RíosCalle Inmigrantes Percara entre 25 de Mayo y ruta 2, Chajarí12Carlos M. Grassini
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 30/09/2026.