Common Grackle

The Common Grackle is a large, highly social member of the icterid (blackbird) family. Widely distributed across North America east of the Rocky Mountains, these birds are frequently seen in large, noisy flocks foraging on lawns, suburban parks, and agricultural fields. Though they appear uniformly black from a distance, or under overcast skies, a closer look in bright sunlight reveals a magnificent, iridescent gloss of deep blues, purples, violets, and bronzes. Resourceful and highly adaptable, the Common Grackle has thrived in human-altered landscapes, though its global populations have seen significant, steady declines in recent decades, leading to its current conservation status of Near Threatened.

The Common Grackle is a slender, tall songbird with a long, heavy bill, long legs, and a distinctive long, graduated tail that it often folds into a V-like "keel" shape during flight and courtship displays.

Key Field Marks

• Plumage: Adult males are entirely black with an intense iridescence. Depending on the subspecies and light angle, the head can appear metallic blue or purple, contrastingly sharply with a body that is either warm bronze ("Bronzed Grackle" of the interior and north) or purplish-green ("Purple Grackle" of the Southeast and mid-Atlantic). Females are slightly smaller, less iridescent, and more brownish-black.
• Eyes: Adults of both sexes possess striking, pale golden-yellow eyes that contrast sharply with their dark plumage. Juveniles have dark brown eyes and dull, soot-brown plumage.
• Bill: The bill is black, long, strong, and slightly curved downward at the tip.

Similar Species

• European Starling: Much smaller with a short tail, speckled plumage, and a bright yellow bill in spring.
• Red-winged Blackbird: Significantly smaller with a shorter, more conical bill and a shorter tail. Males show bold red-and-yellow shoulder epaulets.
• Brewer's Blackbird & Rusty Blackbird: Smaller than grackles with shorter, thinner bills and much shorter tails that lack the distinctive keeled shape. Rusty Blackbirds have a more rounded head shape.

Common Grackles are birds of open and semi-open country. They thrive in human-dominated environments, making extensive use of suburban lawns, golf courses, parks, agricultural fields, orchards, and feedlots. In wilder settings, they are found in open woodlands, forest edges, swamps, and marshes.

Range and Migration

• Breeding Range: Spasmodically covers most of North America east of the Rockies, stretching from central Canada (from Alberta to Newfoundland) south to the Gulf Coast and Florida.
• Wintering Range: Birds breeding in Canada and the northern United States migrate south to spend the winter in the central and southern United States. Populations in the southern half of the range are year-round residents.

Common Grackles are assertive, highly social birds that are almost always observed in groups, especially outside the breeding season when they form massive roosts of thousands or even millions of birds, often mixed with other blackbird species and European Starlings.

Diet and Feeding

Grackles are consummate opportunists. They forage primarily on the ground, walking with a deliberate, swaggering gait rather than hopping. They eat a diverse diet of seeds, acorns, waste grain, insects, spiders, and earthworms. They are also known to hunt small frogs, mice, minnows, and crayfish, and they frequently pirate food from other birds or raid nests for eggs and nestlings.

Vocalizations

The vocalizations of the Common Grackle are harsh and metallic. The primary song is a short, ascending squeak that sounds remarkably like a rusty gate hinge opening. They also emit sharp, loud chack or clack call notes to maintain flock cohesion or sound alarms.

Nesting

Nesting often occurs in loose colonies of up to several dozen pairs. The female builds a bulky cup-shaped nest of twigs, grass, and weeds, plastered together with mud and lined with fine grass. Nests are typically built in dense pine, spruce, or cedar trees, or sometimes in cavities, swamp shrubs, or human structures. The female lays 4–7 pale blue-to-green eggs marked with dark brown scrawls.