How the decline of hunting is changing the natural order of predator and preyTHE TWO WOLVES emerged like specters from the tree line and crossed a field of snow. From that moment, and even after everything that followed, no one disputed their penetrating beauty. Silver on white. Two men watched them approach. The men—a pilot named Todd Svarckopf and an aviation worker named Chris Van Galder—worked at Points North Landing, an outpost that serves local mining camps in Saskatchewan province, about 750 miles north of the U.S. border. On this particular day in November 2005 a low cloud ceiling prevented...