Species Comparisons • Backyard Identification
Brewer’s Blackbird vs Common Grackle
Brewer’s Blackbird
Brewer’s Blackbird • Wikimedia Commons
Brewer’s Blackbird
Brewer’s Blackbird • Wikimedia Commons
Brewer’s Blackbird
Brewer’s Blackbird • Wikimedia Commons
Brewer’s Blackbird
Brewer’s Blackbird • Wikimedia Commons
Common Grackle
Common Grackle • Wikimedia Commons
Common Grackle
Common Grackle • Wikimedia Commons
Common Grackle
Common Grackle • Wikimedia Commons
Common Grackle
Common Grackle • Wikimedia Commons
Brewer’s Blackbird vs Common Grackle (Euphagus cyanocephalus vs Quiscalus quiscula): The Complete Backyard Identification Guide
Field Summary
Quick Answer: The Fastest Way to Tell Them Apart
Two glossy black strutters. Three rules:
- Size and tail: compact with a rounded tail = Brewer’s; big with a long keeled tail = grackle.
- Sheen: purple-green all over = Brewer’s; bronze back with a blue-purple head = grackle.
- Range: West = Brewer’s; East = grackle — they overlap in the Plains.
At-a-Glance Comparison Table
The parking-lot blackbird and the lawn giant, side by side. KEY rows separate fastest.
| Feature | Brewer’s Blackbird | Common Grackle |
|---|---|---|
| Scientific Name | Euphagus cyanocephalus | Quiscalus quiscula |
| Length KEY | 9.0 in (23 cm) | 12.6 in (32 cm) |
| Wingspan | 14.6 in (37 cm) | 14–18 in (36–46 cm) |
| Weight | 2.2 oz (63 g) | 2.6–5.0 oz (74–142 g) |
| Overall Shape | A glossy western blackbird of parking lots, parks and ranches | Large, long-tailed iridescent blackbird with a pale eye |
| Male Plumage KEY | Glossy black with a purple-green sheen and a piercing pale yellow eye | Iridescent blue-purple head, bronze-black body, long keel-shaped tail, pale yellow eye |
| Female Plumage | Plain gray-brown with a dark eye | Like the male but smaller and duller, with less iridescence |
| Bill Shape | Thin, pointed, black | Long, heavy, black, slightly decurved |
| Tail | Medium, rounded | Very long, folded into a deep V (keel) in flight |
| Core Range KEY | The West — open country, towns, parks and farmyards; resident to migrant | East of the Rockies — fields, wetlands, suburbs and parks |
| Migration | Partial migrant; huge winter flocks in the Southwest | Partial migrant; huge mixed blackbird flocks in fall and winter |
| Feeder Presence | Walks the ground under feeders for cracked corn and millet | Descends on feeders in flocks for cracked corn and sunflower; dominates smaller birds |
| Favorite Foods | Seeds, grain, insects — mostly from the ground | Grain, insects, eggs, nestlings, small fish and frogs, refuse |
| Song KEY | A creaky, wheezy “ksh-eee” | A harsh, squeaky “readle-eak” like a rusty gate hinge |
| Flight Call | A sharp metallic “check” | A sharp “chek” |
| Population Trend | Stable; thriving in human-altered open country | Still abundant but declining; fall flocks can number in the thousands |
Male Field Marks, Side by Side
Brewer’s Blackbird — Male
Euphagus cyanocephalus
- Glossy black with a pale yellow eye.
- Purple-green sheen in good light.
- The tame blackbird of western parking lots.
Common Grackle — Male
Quiscalus quiscula
- Iridescent blue-purple head on a bronze-black body.
- Pale yellow eye and long keel-shaped tail.
- Bigger and longer-tailed than any blackbird or starling.
Female & Juvenile Marks, Side by Side
Brewer’s Blackbird — Female
Euphagus cyanocephalus
- Plain gray-brown, dark eye — easy to overlook.
- Walks boldly under picnic tables.
- Winter flocks mix with other blackbirds.
Common Grackle — Female
Quiscalus quiscula
- Smaller and duller than the male, same pale eye.
- Joins mixed blackbird flocks at dusk roosts.
- Walks lawns with a deliberate, long-strided gait.
Part-by-Part Anatomy Breakdown
Every part offers a check:
| Body Part | Brewer’s Blackbird | Common Grackle |
|---|---|---|
| Size | 9 in | 12.5 in — nearly half again as large |
| Tail | Medium, rounded | Long, deeply keeled in display |
| Sheen | Purple-green, even all over | Bronze back, iridescent blue-purple head |
| Bill | Thin, pointed | Long, heavy, slightly curved |
| Eye (male) | Pale yellow | Pale yellow |
| Female | Plain gray-brown, dark eye | Dark bronze, pale eye |
| Voice | Creaky “ksh-eee” | Squeaky “readle-eak” |
Song & Call Comparison
Brewer’s Blackbird
Euphagus cyanocephalus
Song: a creaky, wheezy ksh-eee.
Calls: a sharp metallic check.
Brewer’s Blackbird voice • Wikimedia Commons
Common Grackle
Quiscalus quiscula
Song: a harsh, squeaky readle-eak — the rusty-hinge song.
Calls: a sharp chek; huge roost flocks are deafening.
Common Grackle voice • Wikimedia Commons
Range & Seasonal Presence
The Brewer’s Blackbird owns western open country — parks, ranches and parking lots from the Rockies to the Pacific.
The Common Grackle lives east of the Rockies, west to the Plains. In the central Plains overlap, size and tail shape decide the ID.
Feeder Behavior & Favorite Foods
- Brewer’s Blackbird: cracked corn and millet on the ground.
- Common Grackle: corn, sunflower and suet — dominates platform feeders.
- Management: safflower and weight-sensitive feeders discourage both.
- Habit: grackles soak dry food in birdbaths; Brewer’s rarely bother.
Temperament & Flock Behavior
Brewer’s Blackbirds are calm pedestrians — strutting parking lots, probing lawns, flying up to a low roof when approached.
Common Grackles are swaggering showboats — keel-tailed displays, squeaky songs, and loud flocks mobbing anything edible.
6-Step Backyard ID Checklist
- Size. Mid-sized = Brewer’s; big = grackle.
- Tail. Rounded = Brewer’s; keeled = grackle.
- Sheen. Even purple-green = Brewer’s; bronze + purple head = grackle.
- Bill. Thin = Brewer’s; heavy = grackle.
- Female. Gray-brown, dark eye = Brewer’s; bronze, pale eye = grackle.
- Range. West = Brewer’s; East = grackle.
Frequently Asked Questions
How do you tell a Brewer’s Blackbird from a Common Grackle?
Brewer’s is smaller (9 in) with a rounded tail and an even purple-green sheen. The Common Grackle is 12.5 inches with a long keeled tail, bronze back and heavy bill.
Do both have yellow eyes?
Males of both species have piercing pale yellow eyes — eye color does not separate the males. Female Brewer’s have dark eyes; female grackles keep the pale eye.
Which one is a western bird?
Brewer’s — the West’s parking-lot blackbird. Common Grackles live east of the Rockies, with overlap in the central Plains.
Why do grackles dip their food in water?
To soften it — grackles famously soak bread, kibble and hard seed in birdbaths. Brewer’s Blackbirds rarely do this.
Which species forms bigger flocks?
The Common Grackle — fall and winter flocks can number in the hundreds of thousands, mixing with cowbirds and Red-winged Blackbirds.
Are these blackbirds harmful to crops?
Both take grain, and big grackle flocks can damage cornfields. Around yards, both are harmless — just hungry.
Key Takeaways
- Size: 9 in = Brewer’s; 12.5 in = grackle.
- Tail: Rounded = Brewer’s; keeled = grackle.
- Sheen: Even purple-green = Brewer’s; bronze back = grackle.
- Bill: Thin = Brewer’s; heavy = grackle.
- Female: Gray, dark eye = Brewer’s; bronze = grackle.
- Range: West = Brewer’s; East = grackle.