People around Yellowstone National Park have been agitated by some strange sights lately, and not just the usual glimpses of Elvis and UFOs. The new apparition is the wolf, the magnificent predator that disappeared from the American West more than 60 years ago -- killed off by relentless bounty hunters and government agents. Over the past decade, a few wolves have moved from Canada back into northern Montana and Idaho, but most experts thought it would take many years before they spread out and found ways to cross interstate highways and hostile ranchland to reach Yellowstone.
The first credible claim that...