FILE - In this April 15, 2008, file photo, a bison makes its way across the historic gate to Yellowstone National Park at Gardiner, Mont. As Yellowstone National Park in Wyoming opens for the busy summer season, wildlife advocates are leading a call for a boycott of the conservative ranching state over laws that give people wide leeway to kill gray wolves with little oversight. (James Woodcock/The Billings Gazette via AP, File)
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