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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 Magdalena

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: 600754
  Adult

Magdalena
Buenos Aires
Argentina
09/07/2024
Jorge Blackhall



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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
240474927/12/2025ArgentinaBuenos AiresCañada Arregui, Magdalena4Pablo Richter
240462527/12/2025ArgentinaBuenos AiresCañada Arregui, Magdalena4Julian Uriel Collado
238885204/10/2025ArgentinaBuenos AiresCamino a balneario punta blanca, Magdalena2Julian Uriel Collado
232324620/07/2025ArgentinaBuenos AiresCamino a balneario punta blanca, Magdalena4Julian Uriel Collado
231510228/06/2025ArgentinaBuenos AiresCamino rural entre Rp 20 Y Rp 11, Magdalena7Julian Uriel Collado
231507128/06/2025ArgentinaBuenos AiresRuta Provincial 11, Magdalena22Julian Uriel Collado
230045125/05/2025ArgentinaBuenos AiresVieytes, Magdalena1Gabriel Carbajales
227539705/01/2025ArgentinaBuenos AiresCamino a balneario punta blanca, Magdalena2Julian Uriel Collado
223273112/10/2024ArgentinaBuenos AiresCamino a balneario punta blanca, Magdalena5Silvina Collado
217095512/10/2024ArgentinaBuenos AiresCamino a balneario punta blanca, Magdalena5Julian Uriel Collado
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.