Alaska animals vulnerable to oil drilling? By Hil AndersonUPI Chief Energy Correspondent LOS ANGELES, March 29 (UPI) -- Despite the harsh climate of Alaska's rugged Arctic National Wildlife Refuge, the animals that live there may not be hardy enough to withstand the opening of their pristine habitat to oil exploration. Top A new study issued Friday by the U.S. Geological Survey concluded that the populations of caribou, musk oxen, polar bears and other species that call the remote ANWR home could suffer declines unless human activities in their ranges are restricted, particularly during breeding seasons. The report, which came out...