Yellow-billed Magpie

The Yellow-billed Magpie is found only in California, restricted to the Central Valley and adjacent coastal ranges where scattered oaks and open grassland provide nesting and foraging habitat. In overall pattern it closely mirrors the Black-billed Magpie, but the two never overlap geographically, and this species is set apart chiefly by bill and facial skin color.

Its limited range and colonial nesting habits make it one of the more range-restricted corvids in North America.

• Contour feathers follow the same black-and-white pattern as the Black-billed Magpie: black head, throat, and back with white belly and shoulder patches
• Wing feathers show the same iridescent blue-green flash on black, making feathers alone very difficult to separate from Black-billed Magpie by plumage color
• The bare yellow skin around the eye and the yellow bill are not feather traits, so a feather-only find cannot confirm the species without knowing its California origin
• Tail feathers are long and strongly graduated with green-bronze iridescence, matching the general magpie tail structure

Sexes are similar in plumage, with males slightly larger overall. Juveniles show duller black feathering and a paler yellow bill that brightens with age. A single complete annual molt follows breeding, and the long tail feathers are replaced gradually over an extended period.

• Endemic to California, found only in the Central Valley and adjacent oak-savanna foothills and coastal valleys
• Strongly tied to open oak woodland and farmland with scattered large trees for nesting
• Non-migratory, with a notably small and geographically restricted range for a North American corvid

Yellow-billed Magpies often nest in loose colonies within stands of oaks, building bulky stick nests with a domed roof. They forage on the ground and in trees for insects, small animals, and grain, frequently in family groups or small flocks. Calls are harsh and chattering, very similar to the Black-billed Magpie, and the species has historically been vulnerable to disease outbreaks given its restricted range.