Not a Western US bird, it's a "cousin" of the crow. But it's an award winner, view recommended by www.AZdesertTrips.com | Photo by Alessandra Meniconzi / National Geographic 2015 Photo Contest: Acrobat of the Air. He says "A flock of Alpine choughs (Pyrrhocorax graculus), mountain-dwelling birds, performs acrobatic displays in the air. I was able, during a windy day, to immortalize their impressive flight skills."
gray jay | Research by Karen of AZdesertTrips.com - Found throughout most of Canada, & parts of Western U.S., preferring colder climate areas. They store food by attaching it to trees with their sticky saliva.