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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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Records from Trelew

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: 671839
  Adult

Trelew
Chubut
Argentina
01/15/2026
Zulima América Schupbach
Foto
Photography ID: 671781
  Adult

Trelew
Chubut
Argentina
01/16/2026
Zulima América Schupbach
Foto
Photography ID: 671774
  Adult

Trelew
Chubut
Argentina
01/09/2026
Zulima América Schupbach
Foto
Photography ID: 671771
  Adult

Trelew
Chubut
Argentina
01/06/2026
Zulima América Schupbach
Foto
Photography ID: 669388
  Adult

Trelew
Chubut
Argentina
01/06/2026
Hernán Tolosa
Foto
Photography ID: 572300
♂ ♀
  Adult

Trelew
Chubut
Argentina
02/17/2024
Caro Liberti
Foto
Photography ID: 565390
  Adult

Trelew
Chubut
Argentina
01/12/2024
Zulima América Schupbach
Foto
Photography ID: 563623
  Adult

Trelew
Chubut
Argentina
01/04/2024
Zulima América Schupbach
Foto
Photography ID: 563072
  Adult

Trelew
Chubut
Argentina
01/02/2024
Zulima América Schupbach
Foto
Photography ID: 562635
  Adult

Trelew
Chubut
Argentina
01/01/2024
Zulima América Schupbach
Foto
Photography ID: 558455
  Adult

Trelew
Chubut
Argentina
12/02/2023
Zulima América Schupbach
Foto
Photography ID: 469901
  Adult

Trelew
Chubut
Argentina
10/26/2021
Zulima América Schupbach



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Last Vocalizations published




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Last Filmings published


Video ID: 3269
♂ ♀
  Adult

Trelew
Chubut
Argentina
07/07/2016
Luis Ramón Molina



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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
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
242083806/01/2026ArgentinaChubutTrelewHernán Tolosa
225675627/02/2025ArgentinaChubutLaguna Chiquichano, TrelewAdrian Braidotti
198040017/02/2024ArgentinaChubutLaguna Chiquichano, Trelew4Caro Liberti
194884912/01/2024ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
194025104/01/2024ArgentinaChubutEn casa zona urbana, TrelewZulima América Schupbach
193807602/01/2024ArgentinaChubutEn 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 10/04/2026.