Written by Peter Pearsall/Photo by Peter Pearsall
If you’ve ever been in a grocery store parking lot and locked eyes with a glossy black bird strutting like it owns the place, chances are you’ve met the Brewer’s blackbird (Euphagus cyanocephalus). Common and clever, this often-encountered icterid of western and central North America is a great example of how wildlife adapts to human-altered landscapes.
Brewer’s blackbird males are glossy black with a metallic sheen and striking pale yellow eyes. Females are gray-brown overall with darker wings and eyes that are dark rather than yellow. The species name cyanocephalus literally means “blue-headed,” a nod to the male’s iridescence.
This species breeds across much of western and central North America, from southern Canada down into the western United States. In winter, many populations migrate south into the southwestern U.S. and Mexico, though some birds remain year-round if conditions are mild.
Brewer’s blackbirds are habitat generalists, found in grasslands and open woodlands, wetlands and marsh edges, farms and feedlots, and urban areas, parking lots, and parks.
Brewer’s blackbirds are highly social, especially outside the breeding season, forming large flocks that may mix with other blackbird species. They spend most of their time on the ground, walking (not hopping) in search of food, giving them a distinctive, almost swaggering gait.
Their diet is omnivorous and opportunistic: insects (especially during breeding season), seeds and grains, fruits, and human food scraps.
Breeding season typically runs from April through July. Nests are built by females, usually low in shrubs, trees, or occasionally on the ground. Clutches contain 3–6 eggs, pale with darker markings. Females do most of the incubation, while males defend territory and help feed nestlings. Colonial nesting is common, which offers some protection from predators but can also attract attention from brood parasites like brown-headed cowbirds.
Their calls are varied but often described as harsh, metallic, or squeaky, lacking the musical quality of some songbirds. In flocks, the chatter is constant and typical of most other blackbird species.
Brewer’s blackbird populations experienced declines in parts of their range during the late 20th century, likely due to habitat changes and agricultural practices. However, overall numbers have stabilized, and the species remains widespread and common.
