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 one and the glossy one. Three rules:
- Size and bill: crow-sized with a heavy black bill = crow; robin-sized with a slim bill = grackle.
- Eye: dark = crow; pale yellow = grackle.
- Gloss: flat black = crow; iridescent purple and bronze = grackle.
At-a-Glance Comparison Table
The corvid and the icterid, 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 | 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 | The familiar loud “caw-caw-caw” | A harsh, squeaky “readle-eak” like a rusty gate hinge |
| Flight Call KEY | 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
Every part offers a check:
| Body Part | American Crow | Common Grackle |
|---|---|---|
| Size | 17.5 in, crow-shaped | 12.5 in, robin-sized |
| Plumage | All flat black | Iridescent purple head, bronze body |
| Eye | Dark | Pale yellow |
| Bill | Heavy, all-black | Slimmer, black |
| Tail | Fan-shaped | Very long, keel-folded in flight |
| Flight | Steady rowing wingbeats | Level, direct, tail keeled |
| Call | Deep, familiar “caw” | Squeaky hinge “readle-eak” |
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 covers nearly the whole continent — farms, cities, beaches and woodlands, year-round.
The Common Grackle breeds east of the Rockies and winters in huge mixed blackbird roosts across the Southeast.
Feeder Behavior & Favorite Foods
- American Crow: whole peanuts, cracked corn and scraps; cautious, posts a sentinel.
- Common Grackle: cracked corn and sunflower on platforms; arrives in pushy gangs.
- Birdbath: both dunk food — crows cache, grackles soak.
- Watch the mob: crows mob owls and hawks; grackles join the chorus with squeaks.
Temperament & Flock Behavior
American Crows are wary, family-oriented and famously intelligent — they recognize human faces and hold grudges.
Common Grackles are bold opportunists that walk lawns in long strides and dominate feeders in flocks.
6-Step Backyard ID Checklist
- Size. Crow = crow; much smaller = grackle.
- Eye. Dark = crow; pale yellow = grackle.
- Gloss. Flat black = crow; iridescent = grackle.
- Tail. Fan = crow; long keel = grackle.
- Bill. Heavy = crow; slim = grackle.
- Voice. “Caw” = crow; squeaky hinge = grackle.
Frequently Asked Questions
How do you tell a crow from a grackle?
Crows are much larger and all flat black with dark eyes and a heavy bill. Grackles are robin-sized, iridescent purple-bronze, with pale yellow eyes and a long keel-shaped tail.
Are crows and grackles related?
No — crows are corvids (with jays and ravens); grackles are blackbirds in the icterid family.
Which one says “caw”?
The crow. Grackles give a squeaky, rusty-hinge “readle-eak” and harsh “chack” notes.
Why do crows gather in huge flocks?
Crows form communal winter roosts of thousands, flying out each morning to forage — grackles roost separately in blackbird flocks.
Do crows remember people?
Yes — crows recognize individual human faces and remember both kindness and threats for years.
Which bird is smarter?
Both are clever, but crows rank among the most intelligent birds on Earth — solving puzzles, using tools and teaching their young.
Key Takeaways
- Size: Huge = crow; robin-sized = grackle.
- Eye: Dark = crow; pale yellow = grackle.
- Gloss: Flat black = crow; iridescent = grackle.
- Tail: Fan = crow; keel = grackle.
- Bill: Heavy = crow; slim = grackle.
- Family: Corvid vs blackbird.