Yellow-billed Magpie

Birds > Passeriformes

AT A GLANCE
Common Name: Yellow-billed Magpie
Scientific Name: Pica nuttalli
Category: Birds
Subcategory: Passeriformes
Size: Body length: 16–20 in (42–52 cm); Wingspan: 23–25 in (58–64 cm)
Weight: 5.3–7.4 oz (150–210 g)
Lifespan: 6–10 years in native oak savannas; up to 15 years in wild longevity records
Diet: Omnivore (acorns, grasshoppers, beetles, carrion, berries, and grain)
Habitat: California oak savannas, valley oak woodlands, pastures, and riparian margins
Range: Strictly endemic to the Central Valley and adjacent foothills of California, USA
Conservation Status: Vulnerable (IUCN Red List; severe historic mortality from West Nile Virus)

Overview

The Yellow-billed Magpie (Pica nuttalli) is one of North America’s most charismatic and geographically restricted songbirds, found exclusively within the oak savanna woodlands of California. Instantly recognized by its vibrant canary-yellow bill and bare yellow eye patch, this gregarious member of the crow family (Corvidae) exhibits exceptional social intelligence, elaborate communal roosting habits, and fascinating social funeral rituals when a flock member dies.

Biology and Physical Characteristics

Pica nuttalli is a striking pied corvid sporting glossy black plumage across the head, neck, and chest, contrasted by a snowy-white belly and white shoulder patches. When spread in flight, its black flight feathers and exceptionally long, graduated tail shimmer with intense iridescent greenish-bronze and violet highlights. Its most iconic identifying trait is its stout, bright yellow bill and yellow orbital patch, which distinguishes it from the widespread black-billed magpie.

Behavior and Ecology

Highly social year-round, yellow-billed magpies nest in loose colonial rookeries within the high crowns of valley oaks (Quercus lobata) and live oaks. Pairs construct massive, domed stick nests that can reach three feet in diameter, lined with mud and fine hair. Flocks forage cooperatively on the ground, probing grass for beetles and harvesting acorns to cache for winter sustenance. When an individual dies, nearby magpies gather in branches overhead, vocalizing in a solemn assembly often described as an avian funeral ceremony.

Conservation and Human Impact

Classified as Vulnerable by the IUCN, Pica nuttalli faced a catastrophic population crash in the mid-2000s when the West Nile Virus struck California, killing an estimated 50 percent of the species within three years. Thanks to natural immunity development, populations have slowly stabilized. Urban development and agricultural conversion of native oak woodlands remain persistent threats. Habitat conservation efforts by local land trusts now focus on preserving mature valley oak groves.

Interesting Factoid

When a yellow-billed magpie discovers a deceased flock mate, it calls loudly to summon other magpies; together, up to 40 birds will perch silently in nearby trees for hours in an extraordinary corvid ‘funeral.’

Last updated: October 2026