Red-winged Blackbird

The Red-winged Blackbird is one of the most abundant and conspicuous birds in North American marshes and wet fields, with males displaying a bold red-and-yellow shoulder patch, or epaulet, against glossy black plumage during territorial and courtship displays.

Females look strikingly different from males, entirely lacking the red epaulet and instead showing heavily streaked brown plumage that can easily be mistaken for a large sparrow when seen in isolation.

This strong difference between the sexes means that feather identification for this species depends heavily on which sex the feather came from, with male feathers being far more distinctive than female feathers.

Size and Shape

Medium-length, sturdy contour and flight feathers typical of a marsh blackbird.

Color and Pattern

• Male body feathers are glossy black overall, with the shoulder (lesser wing covert) feathers bright red bordered by yellow or buff.
• Female feathers are entirely different: heavily streaked brown above and below, without any black or red, closely resembling a large sparrow's feathers.
• Male epaulet feathers can look entirely black when covered, since some males can conceal the red beneath dark covert feathers when subordinate.

Comparisons

Male feathers are essentially unmistakable given the bold red-and-yellow shoulder patch. Female feathers require more care, as their streaked brown pattern can resemble sparrows; habitat (marshes and wet fields) and slightly larger size than most sparrows are useful supporting clues.

Strong sexual dimorphism: males are glossy black with red-and-yellow epaulets, while females are cryptically streaked brown, an adaptation for concealment near ground-level marsh nests. Juvenile males resemble females until their first full molt. One complete annual molt occurs after breeding.

Red-winged Blackbirds breed across nearly all of North America in marshes, wet meadows, and roadside ditches. Many populations migrate to winter in the southern United States, often forming enormous mixed-species flocks, while some southern populations are resident year-round.

Males conspicuously display their red epaulets while singing a distinctive "conk-la-ree" song from perches over marsh vegetation, defending territories that may include multiple females. Nests are woven low in marsh vegetation. Winter flocks can number in the tens of thousands. A glossy black feather with red-and-yellow color at the base points to a male; a streaked brown feather from marshy habitat may indicate a female of this species.