🐦 Common Grackle — Species ID Dossier

Caption / Post copy

🐦 Common Grackle · Ep. 17/59

That glossy bird strutting across your parking lot? Look closer — it's not all black.

Blue-purple head. Bronze-green body. Yellow eye that stares right through you. The Common Grackle (Quiscalus quiscula) wears its iridescence like armor, and that long keeled tail is unlike anything else in the backyard.

Four cards breaking down everything: the field marks that ID it on the wire, how it looks cutting across an open sky, that unmistakable rusty-gate screech, and how to tell it apart from its look-alikes.

Card 1 — Perched portrait Six labeled field marks on the adult male. The color shift from blue-purple head to bronze-green body is the main event. Pale yellow iris. Long legs. That center-creased tail.

Card 2 — Flight views Dorsal and ventral. The keel tail trailing behind is diagnostic from 50 yards. Deep wingbeats, direct flight line.

Card 3 — Song & call The Squeaky Gate. Starts low and grating, ends in a metallic rising squeal — once you hear it, you'll never mistake it again. Plus: grackles press live ants into their feathers to kill parasites.

Card 4 — Look-alike comparison Common Grackle vs. Boat-tailed Grackle vs. Brown-headed Cowbird. Size and tail shape cut through the confusion fast.

#CommonGrackle #Grackle #BackyardBirds #BirdID #NorthAmericanBirds #BirdsOfInstagram #FieldGuide #BirdWatching #GouacheIllustration #DailyBirdCard

Card Specs

Card	Content	Size
1	Perched portrait — adult male, 6 field marks, size badge	1080 × 1350 px
2	Flight views — dorsal + ventral, tail crease callouts	1080 × 1350 px
3	Song & call — "The Squeaky Gate", spectrogram, fun fact	1080 × 1350 px
4	Look-alike comparison — 3 species side-by-side	1080 × 1350 px

Species Data (AI knowledge, Cornell Lab / Sibley / Audubon sources)

Morphology

Length: 11–13 in (28–34 cm)
Wingspan: 14–18 in (36–46 cm)
Weight: 2.6–5.0 oz (74–142 g)
Male: Iridescent plumage — head blue-purple, body/back/wings bronze-green; pale yellow iris; long keel-shaped tail with longitudinal center crease; stout slightly decurved pointed black bill; flat-topped head profile; long black legs
Female: Brownish overall, less iridescent, shorter tail

Vocalizations

Mnemonic: "The Squeaky Gate"
Song: Grating squeaky series — low grating start rising to metallic squeal ("grrr-EEK!")
Alarm call: Sharp "CHEK"
Flight call: Piercing "tsss-SEEE"
Pitch: Harsh, scratchy mid-to-high frequency; unmistakable metallic quality

Flight characteristics

Direct flight with deep wingbeats
Long keel tail trails behind — diagnostic in silhouette
Flat-topped head profile visible in flight

Look-alike comparison

Species	Key differences
Boat-tailed Grackle (Q. major)	Much larger; even longer, more exaggerated keel tail; male has dark (not yellow) eye; restricted to coastal SE US
Brown-headed Cowbird (Molothrus ater)	Much smaller; male has brown head + black body; finch-like conical bill; short tail, no keel; no iridescence

Fun fact

Grackles practice "anting" — pressing live ants into their plumage, allowing the formic acid secreted by the ants to kill feather parasites (lice, mites).

Range / habitat

Widespread across eastern and central North America; year-round resident in much of range, migratory in northern portions. Open habitats: suburban lawns, agricultural fields, parking lots, woodland edges, marshes. Highly gregarious — often forages in large mixed-species flocks with starlings and Red-winged Blackbirds.