Bronzed Cowbird Identification Guide
A stocky, red-eyed brood-parasitic blackbird of the southern borderlands, told from Brown-headed Cowbird by its uniform bronze-black body and thick neck ruff.
Read the full Bronzed Cowbird encyclopedia entry →
Key Field Marks
- Medium-sized blackbird with a short, thick, conical bill and a notably thick neck.
- Adult male: glossy black overall with a bronze-greenish sheen, striking red eyes, and a ruff of neck feathers that can be raised into a prominent hackle during display.
- Adult female: dull black to gray-black (duller and grayer in birds from drier western populations), also typically with red eyes.
- Often walks on the ground in an upright, slightly hunched posture while foraging.
Separating It From Similar Species
- Brown-headed Cowbird: male shows a clearly contrasting brown head against a glossy black body and has dark eyes, whereas Bronzed Cowbird is uniformly bronze-black with red eyes and no head/body contrast.
- Brewer's Blackbird: male has pale yellow eyes and a more slender bill; lacks the red eye and neck-ruff display of Bronzed Cowbird.
- Great-tailed Grackle: much larger with a long keel-shaped tail; female grackles are brown, not black.
- The raised neck ruff and hovering display flight of displaying males is distinctive and not shown by other blackbirds.
Habitat, Range & Season
- Found in open country, agricultural fields, brushlands, and urban edges of southern Texas, southern Arizona, and southern New Mexico, south through Mexico and Central America.
- Present year-round in parts of its core range, with some northward post-breeding wandering.
- Like other cowbirds, it is a brood parasite, laying its eggs in the nests of other birds (especially orioles and other icterids) rather than building its own nest.
Voice
- Song is a harsher, more gurgling and creaky series of notes than Brown-headed Cowbird's liquid gurgle.
- Also gives thin, squeaky whistled call notes, often heard during the male's ruffed display flight.
Frequently asked questions
How do you tell a Bronzed Cowbird from a Brown-headed Cowbird?
Bronzed Cowbird males are uniformly glossy bronze-black with red eyes, while Brown-headed Cowbird males have a clearly contrasting brown head, glossy black body, and dark eyes.
What does the Bronzed Cowbird's neck ruff mean?
Displaying males raise the feathers around their neck into a thick ruff or hackle, often while hovering briefly in front of a female, as part of courtship display.
Where do Bronzed Cowbirds live in the United States?
They are found mainly in southern Texas, southern Arizona, and southern New Mexico, in open country, farmland, and brushy edges.
Is the Bronzed Cowbird a nest parasite like other cowbirds?
Yes, Bronzed Cowbirds lay their eggs in the nests of other bird species, particularly orioles and other blackbirds, rather than raising their own young.