Species Guide: Red-winged Blackbird (Agelaius phoeniceus)
Family: Icteridae
The Red-winged Blackbird is a striking and familiar bird across much of North America. Known for its vibrant display of color and distinctive vocalizations, this species is often found in wetlands, marshes, and fields. It plays an important role in both ecosystems and cultural imagery because of its widespread presence and recognizable behaviors.
Appearance
Male Red-winged Blackbirds are easily recognized by their glossy black feathers and bright red shoulder patches edged with yellow. The red patches are most visible during courtship displays and territorial calls.
Females are more subdued in appearance, with heavily streaked brown and buff plumage helping them blend into vegetation, especially during nesting.
Juvenile birds resemble females with brown streaking but may show hints of darker feathers as they mature. Young males begin to develop their black coloration and red epaulets over their first year.
Diet
Red-winged Blackbirds have a varied diet that changes with the seasons. In spring and summer, they often eat insects such as beetles, caterpillars, spiders, and grasshoppers. This protein-rich diet supports breeding and rearing of young. In fall and winter, they shift to seeds and grains, including those of grasses, sedges, and agricultural crops like corn and rice. They are often seen feeding in flocks in harvested fields during cooler months.
Habitat
This species occupies a range of wetland habitats, including freshwater marshes, swamps, wet meadows, and the edges of ponds and lakes. They also use upland agricultural fields, pastures, and roadside ditches. Males typically establish territories within cattail stands and other tall emergent vegetation where they sing from high perches. Females choose nesting sites near water in dense vegetation for cover and protection.
Behavior
Red-winged Blackbirds are highly social outside of the breeding season and often form large flocks with other blackbirds, starlings, and grackles. Their most familiar call is a loud, gurgling series of notes often described as “conk-la-ree,” given repeatedly by males as they defend their territory.
Red-winged Blackbird Call:
These birds are polygynous, meaning males may mate with multiple females. Breeding season begins in early spring when males arrive first to secure territories. Females build cup-shaped nests made of plant material woven into reeds or grasses. They typically lay three to five pale eggs spotted with brown. Incubation lasts about 11 to 13 days, and chicks fledge roughly nine to eleven days after hatching. Many juveniles complete development within a single season.
Biometrics
| Length | 15-17 cm |
| Wing Span | 27-33 cm |
| Body Weight | 70-100 grams |
| Longevity | 2-5 Years |
Natural Predators
Eggs and nestlings are vulnerable to a variety of predators, including raccoons, snakes, crows, and larger birds such as hawks. Adult Red-winged Blackbirds may fall prey to raptors such as Coopers Hawks and Red-shouldered Hawks. Nest site selection among dense vegetation helps reduce risk from some ground and aerial predators.
Relationship to Humans
Humans have long noticed Red-winged Blackbirds because of their loud calls and conspicuous presence. These birds appear in folklore and fables as symbols of the wild landscapes of wetlands and fields. Some cultures view them as messengers or signs of seasonal change. They are also known to impact agriculture. While their consumption of insects can benefit crop health, large flocks feeding on seeds and grains sometimes cause conflicts with farmers. Birdwatchers enjoy observing their displays and listening to their songs in spring and summer.
Conservation Status
Red-winged Blackbirds are currently widespread and common across their range with stable overall populations. They are not considered endangered. Local declines have been noted in some areas due to habitat loss from wetland drainage, pollution, and changes in agricultural practices. Conservation efforts that protect and restore wetland and riparian vegetation support healthy populations of this species.
Global
Conservation Status
Ad Space
References
- Lovette, I. et al. (2016) The Cornell Lab of Ornithology, handbook of bird biology. Third edition. Chichester: Wiley. [Accessed 15/10/2025]
