Species Comparisons • Backyard Identification
Brown-headed Cowbird vs European Starling
Brown-headed Cowbird
Brown-headed Cowbird • Wikimedia Commons
Brown-headed Cowbird
Brown-headed Cowbird • Wikimedia Commons
Brown-headed Cowbird
Brown-headed Cowbird • Wikimedia Commons
Brown-headed Cowbird
Brown-headed Cowbird • Wikimedia Commons
European Starling
European Starling • Wikimedia Commons
European Starling
European Starling • Wikimedia Commons
European Starling
European Starling • Wikimedia Commons
European Starling
European Starling • Wikimedia Commons
Brown-headed Cowbird vs European Starling (Molothrus ater vs Sturnus vulgaris): The Complete Backyard Identification Guide
Field Summary
Quick Answer: The Fastest Way to Tell Them Apart
Two uninvited guests at the feeder. Three rules:
- Bill: short and conical = cowbird; long, pointed, yellow in summer = starling.
- Tail: a visible tail = cowbird; a stub = starling.
- Winter plumage: plain dark = cowbird; speckled all over = starling.
At-a-Glance Comparison Table
The parasite and the usurper, side by side. KEY rows separate fastest.
| Feature | Brown-headed Cowbird | European Starling |
|---|---|---|
| Scientific Name | Molothrus ater | Sturnus vulgaris |
| Length KEY | 7.5 in (19 cm) | 8.5 in (21.5 cm) |
| Wingspan | 14.2 in (36 cm) | 16 in (41 cm) |
| Weight | 1.5 oz (43 g) | 2.1–3.4 oz (60–96 g) |
| Overall Shape | North America’s famous brood parasite — it never builds a nest | A stocky, short-tailed, speckled blackbird with a pointed bill |
| Male Plumage KEY | Glossy black body with a rich chocolate-brown head; dark eye | Glossy purple-green-black in breeding plumage with a yellow bill; heavily speckled in winter (sexes alike) |
| Female Plumage | Plain gray-brown all over with faint streaking; dark eye | Identical to the male |
| Bill Shape | Short, thick, conical | Yellow in spring and summer, dark in winter — long and pointed |
| Tail | Medium, plain | Very short, squared |
| Core Range KEY | Nearly continent-wide in open country — fields, pastures, feedlots | Nearly continent-wide — cities, farms and suburbs everywhere |
| Migration | Partial migrant; big winter flocks with other blackbirds | Mostly resident; huge wheeling winter murmurations |
| Feeder Presence | Ground and platform feeders — millet, cracked corn, sunflower chips | Swarms suet and seed feeders in gangs — a classic feeder bully |
| Favorite Foods | Seeds and insects, picked from the ground near livestock | Insects, seeds, fruit, garbage — a generalist omnivore |
| Song KEY | A liquid “glug-glug-glee” with gurgling notes | A jumbled, squeaky medley with whistles and mimicry |
| Flight Call | A high “chuck” and thin whistles | A descending “tcheer” and metallic squeaks |
| Population Trend | Stable; followed cattle and clearing across the continent | Abundant introduced species; competes with native cavity nesters |
Male Field Marks, Side by Side
Brown-headed Cowbird — Male
Molothrus ater
- Glossy black body, chocolate-brown head.
- Liquid gurgling song from a fence post.
- Follows cattle and mowers for stirred-up insects.
European Starling — Male
Sturnus vulgaris
- Glossy speckled black, yellow bill, very short tail.
- Squeaky, musical, mimicking jumble of a song.
- Gangs take over suet feeders in minutes.
Female & Juvenile Marks, Side by Side
Brown-headed Cowbird — Female
Molothrus ater
- Plain gray-brown — looks like a large sparrow.
- Lays her eggs in other birds’ nests — dozens per season.
- Never builds a nest of her own.
European Starling — Female
Sturnus vulgaris
- Identical to the male.
- Nests in any cavity — evicting bluebirds and woodpeckers.
- Winter murmurations wheel in the thousands.
Part-by-Part Anatomy Breakdown
Every part offers a check:
| Body Part | Brown-headed Cowbird | European Starling |
|---|---|---|
| Bill | Short, thick, conical | Long, pointed; yellow in breeding season |
| Tail | Rounded, medium-short | Very short stub |
| Winter Plumage | Plain glossy (male) or gray-brown (female) | Speckled with white dots |
| Build | Compact, upright | Stocky, hunched, short-legged |
| Flight | Strong, direct | Triangular-winged, direct, in tight flocks |
| Nesting | Lays eggs in other birds’ nests | Takes over cavities — evicts natives |
| Voice | Liquid gurgles, “glug-glug-glee” | Squeaky jumbled medley with mimicry |
Song & Call Comparison
Brown-headed Cowbird
Molothrus ater
Song: liquid gurgles rising into a high whistle — glug-glug-glee.
Calls: a sharp chuck and thin flight whistles.
Brown-headed Cowbird voice • Wikimedia Commons
European Starling
Sturnus vulgaris
Song: a jumbled squeaky medley with whistles, clicks and mimicry.
Calls: a descending tcheer and metallic squeaks.
European Starling voice • Wikimedia Commons
Range & Seasonal Presence
The Brown-headed Cowbird is a native that followed cattle and clearing across the continent — open country everywhere.
The European Starling is introduced (Central Park, 1890s) and now occupies nearly every city, farm and suburb on the continent. They meet at feeders daily.
Feeder Behavior & Favorite Foods
- Brown-headed Cowbird: ground and platform — millet, corn, sunflower chips.
- European Starling: suet gangs, seed swarms — the more aggressive of the two.
- Management: safflower, upside-down suet feeders and weight-sensitive perches discourage both.
- Spillage: cleaning up under feeders removes the main attraction for cowbirds.
Temperament & Flock Behavior
Brown-headed Cowbirds drift in quietly — feeding calmly, females slipping away to scout nests.
European Starlings arrive like a gang — loud, squabbling, emptying suet in minutes and driving off smaller birds.
6-Step Backyard ID Checklist
- Bill. Conical = cowbird; long pointed = starling.
- Tail. Visible = cowbird; stub = starling.
- Winter spots. None = cowbird; speckled = starling.
- Build. Compact upright = cowbird; stocky hunched = starling.
- Male head. Brown = cowbird; glossy black = starling.
- Voice. Liquid gurgles = cowbird; squeaky jumble = starling.
Frequently Asked Questions
How do you tell a Brown-headed Cowbird from a European Starling?
The cowbird has a short conical bill and a visible rounded tail; males are black with a brown head. The starling is stocky with a stubby tail, a long pointed bill (yellow in summer) and speckled plumage in winter.
Which one is native?
The cowbird — a Great Plains native that followed bison, then cattle. The starling was introduced from Europe in the 1890s.
Why are both unloved by birders?
Cowbirds parasitize other birds’ nests; starlings evict native cavity-nesters like bluebirds. Both also mob feeders — but both are fascinating birds in their own right.
What is a murmuration?
The vast wheeling flight formations of starlings — thousands of birds moving as one at dusk. Cowbirds join big mixed blackbird flocks but do not murmurate.
How do I keep both off my suet?
Use upside-down or cage-protected suet feeders, offer safflower seed, and clean up ground spillage daily.
Do starlings and cowbirds flock together?
Yes — winter flocks of blackbirds often combine cowbirds, starlings, grackles and Red-winged Blackbirds in the thousands.
Key Takeaways
- Bill: Conical = cowbird; long pointed = starling.
- Tail: Visible = cowbird; stub = starling.
- Spots: Plain = cowbird; speckled = winter starling.
- Male: Brown head = cowbird; glossy = starling.
- Origin: Native = cowbird; introduced = starling.
- Nest Habit: Parasite = cowbird; cavity usurper = starling.