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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: 692754
  Adult

Trelew
Chubut
Argentina
06/25/2026
Zulima América Schupbach
Foto
Photography ID: 692746
  Adult

Trelew
Chubut
Argentina
06/25/2026
Zulima América Schupbach
Foto
Photography ID: 690883
  Adult

Trelew
Chubut
Argentina
06/06/2026
Zulima América Schupbach
Foto
Photography ID: 690878
  Adult

Trelew
Chubut
Argentina
06/01/2026
Zulima América Schupbach
Foto
Photography ID: 687676
♂ ♀
  Adult

Trelew
Chubut
Argentina
05/18/2026
Zulima América Schupbach
Foto
Photography ID: 683793
  Adult

Trelew
Chubut
Argentina
04/24/2026
Zulima América Schupbach
Foto
Photography ID: 683786
  Adult

Trelew
Chubut
Argentina
04/24/2026
Zulima América Schupbach
Foto
Photography ID: 683768
♂ ♀
  Adult

Trelew
Chubut
Argentina
04/24/2026
Zulima América Schupbach
Foto
Photography ID: 683758
  Adult

Trelew
Chubut
Argentina
04/24/2026
Zulima América Schupbach
Foto
Photography ID: 683757
  Adult

Trelew
Chubut
Argentina
04/24/2026
Zulima América Schupbach
Foto
Photography ID: 683751
  Adult

Trelew
Chubut
Argentina
04/23/2026
Zulima América Schupbach
Foto
Photography ID: 671839
  Adult

Trelew
Chubut
Argentina
01/15/2026
Zulima América Schupbach



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
248657225/06/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
248130406/06/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
248129801/06/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
247195418/05/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
246276324/04/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
246275323/04/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
242901816/01/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
242913515/01/2026ArgentinaChubutÁrea Protegida Municipal Laguna Cacique Chiquichano, TrelewZulima América Schupbach
242901109/01/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
242900806/01/2026ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
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 14/09/2026.