Don't want to see ads? Sign up...




Molothrus bonariensis

Shiny Cowbird


Molothrus bonariensis

(Gmelin, JF, 1789)
Tordo Renegrido
Chupim

Family: Icteridae
Order: Passeriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

 Request change




Filters


Records from Estancia Nahuel Ruca

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


Loading map...




Species photographs

Last published photographs

Foto
Photography ID: 598985
♂
  Adult

Mar Chiquita
Buenos Aires
Argentina
09/08/2024
Celina Emilia Iratchet
Foto
Photography ID: 473005
♀
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/10/2021
José Luis Ianiro
Foto
Photography ID: 473003
♂
  Adult

Mar Chiquita
Buenos Aires
Argentina
10/10/2021
José Luis Ianiro
Foto
Photography ID: 366354
♀
  Adult

Mar Chiquita
Buenos Aires
Argentina
12/01/2019
José Luis Ianiro
Foto
Photography ID: 221121
♂
  Adult

Mar Chiquita
Buenos Aires
Argentina
09/17/2017
Victor Hugo Michelini



 View all photographs of the species




 Add a photography of this species






Species vocalizations

Last vocalizations published



 Add an audio of this species





Species videos

Last filmings published




 Add a film of this species





Species reports



 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
243375931/01/2026ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita13Victor Hugo Michelini
242817127/01/2026ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita20Victor Hugo Michelini
238349801/11/2025ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita3Victor Hugo Michelini
238009118/10/2025ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita6Victor Hugo Michelini
237801104/10/2025ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita23Victor Hugo Michelini
214736008/09/2024ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar ChiquitaCelina Emilia Iratchet
181925526/08/2023ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita8Victor Hugo Michelini
178541001/07/2023ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita4Victor Hugo Michelini
176188829/04/2023ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita4Victor Hugo Michelini
150632010/10/2021ArgentinaBuenos AiresEstancia Nahuel Ruca, Mar Chiquita8José Luis Ianiro
Page 1

 Add a record of this species

📖
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 03/10/2026.