The Porcupine drainage, hub of an expansive wilderness study area, is considered an untrammeled crown jewel and will be increasingly important as a refuge for wildlife stressed by climate change. Writes the Montana Wilderness Association: " this corner of the Greater Yellowstone Ecosystem is one of the few places left with nearly the full complement of species that were here when several tribes hunted in the area and when Lewis and Clark made their journey west." Photo courtesy George Wuerthner