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Bronzed Cowbird - BirdForum Opus

Photo by Gaga
San Ygnacio, Texas, USA, May 2004
Molothrus aeneus

Includes: Bronze-brown Cowbird



  • Iridescent greeny bronze, black plumage
  • Red iris

Female dull grey brown


Female (Western)
Photo by bobsofpa
Cottonwood Campground, Big Bend National Park, Texas, USA, April 2010

Southwestern California, southern New Mexico, southern Arizona, and southern Texas south to northern Colombia.

Rare to casual vagrant along the rest of the gulf coast. Accidental vagrant to Utah, Colorado, Missouri, and Nova Scotia.



This is a polytypic species, consisting of four subspecies:

  • M. a. loyei:
  • South-western US to north-western Mexico (Sonora, Chihuahua, Durango and Nayarit)
  • M. a. assimilis:
  • South-western Mexico (Jalisco to Colima, Guerrero, Puebla, Oaxaca, Chiapas)
  • M. a. aeneus:
  • M. a. armenti:
  • Caribbean coast of northern Colombia - sometimes split as Bronze-brown Cowbird


Open fields, scrubland, and forest.



It is a brood parasite, laying its blue green eggs in the nests of other birds.


  1. Clements, JF. 2009. The Clements Checklist of Birds of the World. 6th ed., with updates to December 2009. Ithaca: Cornell Univ. Press. ISBN 978-0801445019.
  2. Wikipedia

Recommended Citation

External Links

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