White-tailed Deer? No—most likely a Black-billed Magpie tail feather

Black-billed Magpies are boldly patterned corvids with long graduated tails, black-and-white plumage, and blue-green wing and tail sheen. They are intelligent, vocal, social birds with a buoyant flight style and varied chattering calls.

Glossy black over most of the vane, transitioning abruptly to white at the distal tip. Subtle blue-green iridescence may be present in the dark portion; exact species identification from a single feather remains uncertain.

Pennaceous and tightly interlocked, with intact but slightly weathered barbs; no obvious aftershaft or specialized owl edge.

Rachis is slender and dark, with dense, sleek barbs aligned smoothly along the shaft; the white tip affects the distal barbs and shaft appearance.

Smooth, stiff, and slightly glossy, typical of a flight-related rectrix; the black vane shows mild wear and surface dulling.

Likely from the tail, inferred from its narrow, elongated form and sharply contrasting terminal white area.

Very long black tail feather with a clean white terminal section; glossy dark vane and narrow, tapered rectrix shape are the strongest clues.

Black-billed Magpies occupy open country, grasslands, agricultural areas, riparian corridors, shrublands, and suburban landscapes, often nesting in thorny trees or shrubs.

Resident primarily across western North America, from Alaska and western Canada through the Great Basin and northern Rocky Mountains into the northwestern United States.

An omnivorous scavenger, predator, and seed disperser, the magpie links insects, carrion, seeds, and small vertebrates within open-country food webs. Black-billed Magpies are generally widespread and considered of low conservation concern.

Yellow-billed Magpie has a similar black-and-white tail but is geographically restricted to California. Black-and-white tail feathers of jays, crows, or woodpeckers differ in proportions and usually lack this sharply bounded white tip.

Magpies cache food, recognize themselves in mirrors, and are among the most cognitively complex birds. Their nests often have domed roofs and multiple entrances.

Magpie feathers have cultural significance in some Indigenous traditions, but possession of wild native bird feathers may be regulated under wildlife laws; they should not be commercially collected without authorization.

Search beneath communal roosts, fence lines, nest areas, and regular perches, especially after late-summer molt. Compare length, symmetry, tip pattern, and iridescence with a reference specimen; avoid relying on color alone.

Apparently naturally molted, with minor fraying near the base and moderate surface wear; no obvious fault bars, oiling, or parasite damage. Condition: Good.