Big cats migrate east in search of prey
                                
                                
                                    (Newser) -
                                    Pumas, normally prowlers of the Rocky Mountains, are slowly pushing east, ecologists say, which has led to a rash of sightings throughout the Midwest. Wisconsin just had its first confirmed puma sighting in over a century, and since 1990 the big cats have cropped up in Minnesota, Iowa, Missouri and...