Bird Fact Friday– Screaming & Shiny Cowbirds

Adapted from page 228 of Birds of Chile:

Shiny cowbirds (Molothrus bonariensis) are fairly common in Central Chile, north of Atacama and south of Los Lagos; they are uncommon in Arica, and rare in east Aysén. They inhabit farmland, matorral, open woodland, villages, towns, and are often near livestock. They mainly live in small groups; in winter, locally in flocks of 100s. They feed on ground and lay eggs in nests of other species. Their song is a high, slightly sweet to tinny and buzzy warble, made from perch or in short flight around female. The male call has high thin seeíh, the female call is a bubbling rattle. Juveniles have a variable streaking on underparts.

Young cowbirds are raised by ‘host’ species; in this case a male Yellow-winged Blackbird feeds a juvenile Shiny Cowbird.

The Screaming Cowbird (Molothrus rufoaxillaris) was recently discovered (2010) in Central Chile. They are uncommon but apparently spreading in O’Higgins, with sightings also in Santiago. They are frequently found in farmland and matorral with hedges and trees, often in rural areas, gardens. Juvenile cowbirds travel with Austral Blackbirds, which appear to be their ‘host’ species in Chile. Their songs are variably disyllabic, and sound like an abrupt, whistled seeih! Calls are a low clucking chk and varied wet buzzes. Juvenile birds are buffy gray overall and have bright rusty wings. Immature birds have messy black patches.

Birds of Chile
A Photo Guide
By Steve N. G. Howell & Fabrice Schmitt

This is the first modern-style photographic field guide to the birds of Chile, an increasingly popular destination with birders and naturalists. Compact and easy to carry, pack, and use, Birds of Chile is ideal for curious naturalists and experienced birders alike, providing everything anyone needs to identify the birds they see. Clear photographs and brief, facing-page species accounts highlight what to look for and how to quickly identify species. The photos include both close-ups and birds-in-habitat images to further aid real-life identification. An introduction and maps provide an overview of Chile’s geographic regions and their distinctive birdlife. Birds of Chile is also a great resource for birding in nearby countries, especially Argentina, Bolivia, and Peru.


  • The first field-friendly photographic guide to the birds of Chile
  • More than 1,000 real-life photos and brief, facing-page text make bird identification easy
  • Overview and maps describe the distinct bird regions of Chile
  • Perfect for curious naturalists and experienced birders alike
  • Compact and easy to carry and pack
  • Also a great resource for birding in Argentina, Bolivia, and Peru


This post is part of a series, explore additional posts here<< Bird Fact Friday: the Caracaras of ChileBird Fact Friday– the American robin, a wood thrush & their song >>