Red-winged Blackbird

The Red-winged Blackbird (Agelaius phoeniceus) is one of the most abundant, conspicuous, and thoroughly studied songbirds in North America. Instantly recognizable by the male's glossy black plumage and vibrant shoulder epaulets, this species is a classic symbol of the transition from winter to spring. While they are most famous for inhabiting cattail marshes, they are incredibly adaptable and can be found in a wide variety of open, wet, or grassy environments. Their highly social nature features massive winter roosts and a strongly polygynous breeding system in the spring.

The Red-winged Blackbird exhibits extreme sexual dimorphism, which often confuses beginner birdwatchers.

Male

• Plumage: Jet-black all over, except for the highly conspicuous crimson-red shoulder patches (epaulets) which are bordered beneath by a bright yellow-to-buff band.
• Shape: Stocky, broad-shouldered songbird with a medium-length tail and a sharply pointed, conical bill.
• Key Behavior: The red patches can be puffed out during territorial displays or concealed almost entirely when the bird is resting or trying to avoid conflict, leaving only a thin yellow line visible.

Female

• Plumage: Completely different from the male. Heavily streaked with dark brown, whitish, and warm buff overall, looking somewhat like an oversized sparrow.
• Head Pattern: Prominent whitish or buffy eyebrow stripe (supercilium), often with a subtle peach or apricot wash around the throat and face.

Similar Species

• Tricolored Blackbird: Located primarily in California, the male Tricolored has darker, crimson-red epaulets bordered by a stark white band (rather than yellow) and tends to nest in much denser, highly colonial groups.
• Yellow-headed Blackbird: Shares marsh habitats, but features a bright yellow head and chest.
• Brown-headed Cowbird: Females are uniform grayish-brown and lack the heavy, sharp-edged streaking of female Red-winged Blackbirds.

Red-winged Blackbirds breed in fresh and saltwater marshes, wet meadows, swales, ditches, and agricultural fields. They show a strong preference for wetlands containing emergent vegetation like cattails, rushes, and reeds.

Range & Migration

• Breeding Range: Extends from Alaska and northern Canada all the way to the southern United States and Central America.
• Migration: Northern populations are highly migratory, heading south in the autumn to wintering grounds across the southern US and Mexico. Southern populations are largely resident year-round.
• Winter Roosts: During the non-breeding season, they gather in colossal mixed-species flocks with other blackbirds, grackles, starlings, and cowbirds, sometimes numbering in the millions of individuals.

Red-winged Blackbirds are dynamic, noisy, and highly active birds whose behavior changes dramatically across the seasons.

Breeding & Territoriality

In the spring, males fiercely defend nesting territories that average a quarter of an acre. A single dominant male may mate with up to 15 different females within his territory. Males spend more than half of daylight hours perched prominently on high stalks, singing their distinctive song while bowing, arching their wings, and flaring their brilliant red epaulets. They are notoriously aggressive defenders, boldly mobbing much larger intruders including crows, hawks, and even humans who wander too close to their nests.

Nesting & Diet

Females construct a remarkably sturdy woven cup-nest made of grass, reeds, and decayed leaves, typically suspended among standing cattail stalks or low shrubs over water or damp ground.

• Spring/Summer Diet: Primarily insectivorous, consuming caterpillars, beetles, spiders, dragonflies, and other invertebrates.
• Fall/Winter Diet: Shift to a heavily seed-based diet, foraging in fields for weed seeds, corn, wheat, rice, and grain.

Vocalizations

• Song: The male's signature vocalization is a liquid, buzzy, metallic trill usually transcribed as conk-la-ree!.
• Calls: A sharp, high-pitched chack or chek call used as an alarm or contact note, and a slurred, descending cheer whistle when threatened.