Species Comparisons • Backyard Identification
American Crow vs Common Grackle
American Crow
American Crow • Wikimedia Commons
American Crow
American Crow • Wikimedia Commons
American Crow
American Crow • Wikimedia Commons
American Crow
American Crow • 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
American Crow vs Common Grackle (Corvus brachyrhynchos vs Quiscalus quiscula): The Complete Backyard Identification Guide
Field Summary
Quick Answer: The Fastest Way to Tell Them Apart
The “big black bird” confusion, resolved. Three rules:
- Size: hawk-sized at 17.5 inches = American Crow; barely robin-and-a-half at 12.6 inches = Common Grackle. Side by side, the difference is dramatic.
- Eye and sheen: dark eye and even black plumage = crow; a staring pale-yellow eye and an iridescent blue-purple head = grackle.
- Tail: short squared fan = crow; a long tail folded into a deep V (the keel) in flight = grackle.
At-a-Glance Comparison Table
Crow vs grackle, side by side. KEY rows separate fastest.
| Feature | American Crow | Common Grackle |
|---|---|---|
| Scientific Name | Corvus brachyrhynchos | Quiscalus quiscula |
| Length KEY | 17.5 in (45 cm) | 12.6 in (32 cm) |
| Wingspan | 36–39 in (91–100 cm) | 14–18 in (36–46 cm) |
| Weight | 11–21 oz (320–600 g) | 2.6–5.0 oz (74–142 g) |
| Overall Shape | Large all-black songbird with a fan-shaped tail | Large, long-tailed iridescent blackbird with a pale eye |
| Male Plumage KEY | Entirely black with a slight gloss; stout black bill (sexes alike) | Iridescent blue-purple head, bronze-black body, long keel-shaped tail, pale yellow eye |
| Female Plumage | Identical to the male, averaging slightly smaller | Like the male but smaller and duller, with less iridescence |
| Bill Shape | Stout, straight, all-black bill | Long, heavy, black, slightly decurved |
| Tail KEY | Squared to slightly rounded fan tail | Very long, folded into a deep V (keel) in flight |
| Core Range | Nearly the entire US and southern Canada; cities, farms, woods and shores | East of the Rockies — fields, wetlands, suburbs and parks |
| Migration | Mostly resident; northern birds shift south in winter roosts | Partial migrant; huge mixed blackbird flocks in fall and winter |
| Feeder Presence | Takes cracked corn, peanuts, eggs and table scraps from platforms | Descends on feeders in flocks for cracked corn and sunflower; dominates smaller birds |
| Favorite Foods | Omnivore: grain, insects, carrion, eggs, fruit, refuse | Grain, insects, eggs, nestlings, small fish and frogs, refuse |
| Song KEY | The familiar loud “caw-caw-caw” | A harsh, squeaky “readle-eak” like a rusty gate hinge |
| Flight Call | Varied caws; also rattles and knocks | A sharp “chek” |
| Population Trend | Common and adaptable; numbers fluctuate with West Nile virus cycles | Still abundant but declining; fall flocks can number in the thousands |
Male Field Marks, Side by Side
American Crow — Male
Corvus brachyrhynchos
- All black with a squared fan tail.
- Steady rowing wingbeats in flight.
- Familiar loud “caw-caw”.
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
American Crow — Female
Corvus brachyrhynchos
- Identical to the male.
- Family groups cooperatively raise young.
- Gathers in huge winter roosts.
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
Size, eye, tail — three independent checks:
| Body Part | American Crow | Common Grackle |
|---|---|---|
| Size | 17.5 in, hawk-sized | 12.6 in, blackbird-sized |
| Eye | Dark | Pale yellow, staring |
| Plumage Sheen | Slight even gloss | Blazing iridescent blue-purple head, bronze body |
| Tail | Squared fan | Long, folded into a keel in flight |
| Bill | Stout, straight, all-black | Longer, slimmer, slightly decurved |
| Flight | Steady rowing wingbeats | Level, tail keeled, direct |
| Voice | Clear “caw-caw” | Squeaky “readle-eak” and sharp “chek” |
Song & Call Comparison
American Crow
Corvus brachyrhynchos
Voice: the familiar loud caw-caw-caw, plus rattles and imitations.
Behavior: mobbing calls assemble the neighborhood against owls and hawks.
American Crow 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 American Crow lives nearly everywhere in the US and southern Canada.
The Common Grackle lives east of the Rockies in fields, wetlands, suburbs and parks; northern birds migrate, joining huge mixed blackbird flocks in fall and winter. In the East, any “black bird” at a feeder is far more likely a grackle than a crow.
Feeder Behavior & Favorite Foods
- American Crow: takes corn, peanuts, eggs and scraps from ground platforms — deliberate, scheduled visits by a family group.
- Common Grackle: arrives in flocks and empties feeders of cracked corn and sunflower, dominating by numbers; a cage-style feeder or safflower seed keeps them manageable.
- Deterrence: safflower and nyjer are largely ignored by grackles; crows simply need spill-proof platforms.
- Behavior clue: crows walk with a deliberate strut; grackles stride with heads high, tails dragging behind them.
Temperament & Flock Behavior
American Crows are wary and calculating — they watch humans, remember faces, and post sentries.
Common Grackles are brash and relentless — flocking birds that overwhelm feeders by sheer numbers and squabble constantly in rusty-hinge voices.
6-Step Backyard ID Checklist
- Size. Hawk-sized = crow; blackbird-sized = grackle.
- Eye. Dark = crow; pale yellow = grackle.
- Sheen. Even black = crow; blue-purple head on bronze body = grackle.
- Tail. Squared fan = crow; long keel = grackle.
- Voice. “Caw” = crow; rusty-hinge squeal = grackle.
- Numbers. Family group of 2–6 = crows; a swirling flock of dozens = grackles.
Frequently Asked Questions
How do you tell a Common Grackle from an American Crow?
Size, eye and tail: the crow is much larger with a dark eye and a short squared tail; the grackle has a pale yellow eye, an iridescent blue-purple head and a long keel-shaped tail.
Are grackles and crows related?
No — the crow is a corvid (with jays and ravens); the Common Grackle is an icterid, in the blackbird family. The black plumage is coincidence.
Which black bird empties my feeders?
Almost always the grackle — flocks of them descend on cracked corn and sunflower. Crows visit feeders too, but in small family groups and on a schedule.
What does a Common Grackle sound like?
Its song is a harsh squeaky “readle-eak” compared to a rusty gate hinge, plus a sharp “chek” call — nothing like the crow’s clear “caw”.
Why do grackles’ tails look folded?
In flight, males fold their long tails lengthwise into a deep V called a keel — a grackle signature visible at long range. Crow tails stay flat fans.
Do crows and grackles flock together?
Sometimes in winter mixed blackbird roosts, but crows keep their own company more often. A huge swirling blackbird flock at dusk is mostly grackles, starlings and red-wings.
Key Takeaways
- Size: Hawk-sized = crow; blackbird-sized = grackle.
- Eye: Dark = crow; pale yellow = grackle.
- Sheen: Even black = crow; iridescent blue-purple head = grackle.
- Tail: Squared fan = crow; long keel = grackle.
- Voice: “Caw” = crow; rusty-hinge squeal = grackle.
- Flocks: Family group = crows; swirling dozens = grackles.