Watercolor portrait of Brown-headed Cowbird (Molothrus ater)

Brown-headed Cowbird

Molothrus ater
Partially migratory Found in a variety of open and semi-open… Common Resident Song

Learn to identify the Brown-headed Cowbird by ear. Master the "liquid gurgling 'glug-glug-gleee" phrase and tell it apart from similar species.

liquid gurgling 'glug-glug-gleee

What the Brown-headed Cowbird sounds like

The Brown-headed Cowbird is a small, stocky blackbird with a fascinating reproductive strategy. Males have glossy black bodies with distinctive brown heads, while females are plain grayish-brown throughout. As obligate brood parasites, they never build nests, instead laying eggs in the nests of other bird species.

liquid gurgling 'glug-glug-gleee

How to tell it apart

Listen for:A bubbly, watery, gurgling series of notes that rises in pitch at the end. Often given from an exposed perch during breeding season. Often written as liquid gurgling 'glug-glug-gleee.
Don't confuse with:The Brewer's Blackbird — male has entirely black head (not brown) with iridescent purple sheen.

Lessons featuring the Brown-headed Cowbird

Ready to test your ear? Practice identifying the Brown-headed Cowbird's sounds in these interactive in-app lessons.

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Where you'll hear it

Found in a variety of open and semi-open habitats including grasslands, woodland edges, fields, pastures, meadows, and suburban areas. Often associated with grazing livestock, which flush insects from vegetation. Avoids dense unbroken forests.

Most active during daylight hours. Breeding season extends from April through July in most areas.

Similar species

Brewer's Blackbird

Male has entirely black head (not brown) with iridescent purple sheen.

Rusty Blackbird

Breeding male is all black with greenish gloss, no brown head.

Bronzed Cowbird

Larger with entirely black plumage including head.

Brown-headed Cowbird song FAQ

What does a Brown-headed Cowbird sound like?
A bubbly, watery, gurgling series of notes that rises in pitch at the end. Often given from an exposed perch during breeding season. Listen for the "liquid gurgling 'glug-glug-gleee" phrase.
How do I tell a Brown-headed Cowbird from a Brewer's Blackbird by sound?
Brewer's Blackbird: Male has entirely black head (not brown) with iridescent purple sheen.; Female is darker, more uniformly colored than female cowbird.; Longer, more slender bill and longer tail..
When is the best time to hear a Brown-headed Cowbird?
Most active during daylight hours. Breeding season extends from April through July in most areas.