Looks like bear to me. Porcupine usually peel smaller diameter trees and peel nearly the whole stem. Bears peeling spruce is actually very common, I see them hit spruce and only spruce in the Kalaloch area every year when the spruce is the only one that has the sap running. They are usually only peeling one species at a time because that is the species that is prime at that time of year. Digging and peeling the roots happens regularly too. They tell you that 20+- year timber is where all the peeling is but the peeling is usually where the bear are. In areas on the ONF that is old growth I've seen them peel four foot plus white fir, and they hit the same trees year after year like one of the photos that was posted.
