White Mountains (2007) by Brian L. Frye; video, color, silent, 1.5 minutes.
A few weeks ago, I hiked out and back on the Summit Trail in the White Mountains. It had rained all week, and the trail was a creek in places. Spent two nights in a little BLM log cabin shelter in a saddle, and saw two porcupines. They like to chew on plywood.