They sit on fenceposts and road signs or flap across rangelands, their white wing patches flashing and their very long tails trailing behind them. This large, flashy relative of jays and crows is a social creature, gathering in numbers to feed at carrion. They’re also vocal birds and keep up a regular stream of raucous or querulous calls.
Congratulations to ljmarine & gsogirl1959 for their correct guess of the Magpie.
The Black-billed Magpie (Pica hudsonia) is a bird in the crow family that inhabits the western half of North America. It is notable for its domed nests, and for being one of only four North American songbirds whose tail makes up half or more of the total body length (the others being the Yellow-billed Magpie, the Scissor-tailed Flycatcher, and the Fork-tailed Flycatcher).