The Black-billed Magpie (Pica hudsonia) is a striking member of the crow family (Corvidae) found across western North America. Distinguished by its bold black-and-white plumage, long tail, and heavy black bill, this bird is easily recognized by its iridescent bronze-to-green sheen on the wings and tail. Its behavior is equally distinctive: it walks with a swaggering gait, hops before taking flight, and displays a unique J-shaped flight trajectory created by alternating wing flaps and pauses. As an opportunistic omnivore, it forages on the ground in meadows and clearings, often near water, and builds elaborate domed nests in trees.
Black-billed Magpies are mid-sized birds, ranging from 45 to 60 cm in length with a wingspan of 56 to 61 cm. They weigh between 145 and 210 g. The head, upper breast, back, and tail are black, while large patches of white appear on the wings and lower breast. At a distance, the bird appears primarily black and white, but closer inspection reveals colorful iridescent patches ranging from bronze to green on the tail, body, and wings. The bill is heavy and black, as are the legs. Females are approximately 10% smaller than males, though both sexes share similar coloration.
In North America, the Black-billed Magpie is one of only two magpie species, the other being the Yellow-billed Magpie (Pica nuttalli). The two are easily distinguished by bill color and breeding range: Yellow-billed Magpies are found only in California, while Black-billed Magpies occupy a much broader range from Alaska and Yukon to western Canada and the western USA. Historically, Black-billed Magpies were considered a subspecies of the Eurasian Magpie (Pica pica), but mitochondrial DNA evidence suggests the two North American species are more closely related to each other and may share a common ancestor distinct from the Eurasian lineage.
Black-billed Magpies inhabit rangeland and wooded country with open fields, usually close to water. They require wooded areas and shrubby thickets for nesting and as escape cover, while meadows and clearings serve as foraging grounds. These conditions are typically met in edge and riparian habitats, as well as in farm sites and agricultural areas where trees and shrubs are strong enough to support their bulky nests. They are found at elevations up to 3,000 meters. While considered non-migratory, they are not strictly sedentary; post-breeding and winter movements can cover several hundred kilometers, sometimes in large groups.
These corvids are highly social and intelligent. They live in family flocks of 6 to 10 birds during the breeding season. In the non-breeding season, larger communal roosts of up to several hundred birds form, primarily for social purposes. In cold weather, they roost in coniferous trees, using branches for protection from wind and predators rather than huddling together. Their territorial behavior is flexible; when food is abundant, nests may be built in close proximity, whereas scarce resources lead to more dispersed nesting. They may defend a territory of approximately 0.3 hectares, often passively advertising their presence by sitting silently in treetops.
One of their most recognizable behaviors is their flight pattern. Horizontal flight consists of slow, steady wing beats, but descending flight involves short series of wing flaps interspersed with pauses where the wings are tucked tight to the body. This creates a distinctive J-shaped trajectory. On the ground, they walk with a swaggering gait and frequently hop before flying. They have also been observed gathering around deceased conspecifics, a behavior likened to a funeral, though its purpose remains unclear. Additionally, they can flip objects over with their bill or foot, a dexterity that sets them apart from some other corvids.
Like other corvids, Black-billed Magpies are opportunistic omnivores. They primarily forage on the ground, eating insects and larvae, eggs and hatchlings of songbirds, fruit, grain crops, and small mammals such as mice and meadow voles. They also scavenge carrion and are often seen along roadsides picking at roadkill and human refuse. They dig small depressions in the ground or snow to store food. Their diet can be partially determined by the small pellets they regurgitate soon after eating.
Black-billed Magpies form monogamous pairs, sometimes for life, though mate switching occurs in some regions. Courtship involves the male flashing his wings and flaring his tail, while the female calls loudly during her fertile period. Males vigilantly guard their mates to prevent extra-pair copulations. Breeding occurs from late March to early June, depending on location. There is usually one brood per season, with a second attempt possible if the first fails.
Both sexes construct an elaborate, domed nest, a process that takes 5 to 7 weeks. The male builds the 60 to 120 cm high dome, while the female constructs the egg bowl, a mud cup lined with hair, grasses, bark strips, fibrous roots, and feathers. The female is the sole incubator and relies entirely on the male for food during this period. If either mate dies during incubation, the brood does not survive. The female lays up to 9 eggs (average 6), which are greenish-gray with brown markings. Hatching is asynchronous, with one chick hatching per day. Fledging occurs 24 to 30 days after hatching. Parents feed the young in or near the nest for the first 3 to 4 weeks, and the post-fledging period is much longer than in crows, likely serving to teach young birds how to recognize danger. Young become independent at about 70 days.
Black-billed Magpies have a harsh, rattling basic alarm call that varies in volume and speed depending on the level of danger. This call may incite mobbing behavior against predators. A second, staccato alarm is quicker and more excited, signaling the need to flee from a more dangerous predator. While a wide range of vocalizations has been documented in European magpies, more research is needed on the specific vocal repertoire of North American species. Like other corvids, they are highly intelligent and can be taught to speak words and phrases when kept captive from a young age, though this is not a natural field behavior.
Black-billed Magpies are listed as Least Concern (LC) in the AviList v2026 checklist. They are generally common throughout their range. Historically, they were treated as pests in the first half of the 20th century due to their consumption of crops, poultry, and livestock. Although control efforts still occur in certain agricultural areas, they are fully protected in the U.S. under the Migratory Bird Treaty Act. In Canada, they currently receive no specific protection.
To observe Black-billed Magpies ethically, focus on their natural habitats: open fields near wooded edges or riparian zones. Watch for their distinctive J-shaped flight pattern and swaggering ground gait from a distance. Avoid approaching nests, as the female is highly dependent on the male for food during incubation, and disturbance can lead to nest abandonment. Listen for their harsh alarm calls, which may indicate the presence of a predator or a nearby nest. If you see them foraging on the ground, maintain a respectful distance to avoid stressing the birds or altering their natural foraging behavior.
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