
Brown-headed Cowbird
Kingdom: Animalia, Phylum: Chordata, Class: Aves, Order: Passeriformes, Family: Icteridae, Genus: Molothrus, Species: M. ater
AI-generated identification · may be incorrectFamily: Icteridae (Troupials and Allies)
- Shape
- Symmetrical vane, slightly rounded to tapered tip, overall oval-to-elongated contour shape.
- Size
- Approximately 2 to 2.5 inches long, consistent with a medium-sized passerine body feather.
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Description
The Brown-headed Cowbird is a small blackbird known for its brood parasitic lifestyle, laying its eggs in the nests of other bird species. Males feature glossy black bodies and contrasting chocolate-brown heads.
Colour & Pattern
Dark brownish-black to glossy black with subtle iridescence under direct light, consistent with the plumage of an adult male Brown-headed Cowbird.
Barb Structure
Pennaceous upper portion with tightly interlocked barbs and barbicels, transitioning into a slightly plumulaceous (fluffy) base.
Rachis & Barb Pattern
Central rachis is slender, dark brown to black, flexible, with uniform barb density radiating outwards at a moderate angle.
Texture & Surface
Smooth, semi-glossy finish with a sturdy yet flexible vane structure.
Feather Placement
Breast or back covert, determined by the curved contour shape, relative size, and uniform coloration typical of passerine body feathers.
Key Features
Glossy dark brownish-black coloration, slender dark rachis, and compact passerine contour shape.
Habitat
Open country, agricultural fields, pastures, brushy edges, and urban/suburban areas.
Geographic Range
Widespread across North America, breeding from southern Canada through the United States, wintering into Mexico.
Ecological Role
Acts as an obligate brood parasite, which can significantly impact local songbird populations by reducing their reproductive success.
Similar Species
Red-winged Blackbird or Common Grackle, though those species typically have larger feathers or distinct iridescent sheen.
Interesting Facts
Cowbirds never build their own nests. Instead, they rely on over 200 other host species to raise their young.
Cultural Significance
No significant traditional or commercial uses, as small passerine feathers are generally protected and not used in historical millinery to the extent of large game birds.
Field Identification Tips
Often found near agricultural fields or bird feeders where mixed flocks of blackbirds congregate.
Condition Notes
Good condition with intact barbs and minimal wear, showing fresh dark pigmentation.