A herd of musk ox graze in an area of the Arctic National Wildlife Refuge in Alaska, known as Area 1002, in this undated file photo. (AP Photo/Arctic National Wildlife Refuge, File) ** FILE **
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A herd of musk ox graze in an area of the Arctic National Wildlife Refuge in Alaska, known as Area 1002, in this undated file photo. (AP Photo/Arctic National Wildlife Refuge, File) ** FILE **
