Contrary to the notion that vacations are best enjoyed "unplugged," if you're hoping to catch a glimpse of wolves, grizzly bears and bison at Yellowstone National Park, the best place to be on the lookout may soon be a cellphone. New smartphone apps enable people to pinpoint where they've recently seen critters in Yellowstone. People who drive to those locations can -- at least in theory -- improve their odds of seeing wildlife compared to the typical tourist's dumb luck. One app called Where's a Bear promises "up to the second" animal sightings in Yellowstone. Recently a website called Yellowstone Wildlife began offering a similar app.