The Black-billed Magpie has a wide-ranging diet. They enjoy fruit, insects, eggs, small mammals, and even carrion. They sometimes cache food for short amounts of time, when a source is abundant. Although they typically prefer open habitats, the Black-billed Magpie will nest in deciduous trees or shrubs that are located up off the ground. Both sexes will aid in building a large, domed, canopy-like stick nest. Females will lay 1-9 tan-colored, brown-speckled eggs, producing a single brood per year.