Washington Post: For six decades since they loped across frozen Lake Superior to reach this rocky island, wolves have roamed 45-mile-long Isle Royale, the nation’s least-visited national park. The wolves survived the extermination efforts by the island’s few inhabitants, who in the 1950s and ’60s saw them as mortal enemies. And they survived an outbreak of deadly canine parvovirus in the 1980s. Now, scientists tracking the wolves in the world’s longest-running “single predator-single prey” …