FILE - This Jan. 3, 2003 file photo shows a lone bison 

FILE - This Jan. 3, 2003 file photo shows a lone bison crossing a road ahead of a pack of snowmobilers in Yellowstone National Park, Wyo. The National Park Service has been studying and taking comment on an initial plan to allow up to 480 snowmobiles plus 60 multiple passenger snow coaches per day into Yellowstone during the winter (AP Photos/Craig Moore, file)
Associated Press
FILE - This Jan. 3, 2003 file photo shows a lone bison crossing a road ahead of a pack of snowmobilers in Yellowstone National Park, Wyo. The National Park Service has been studying and taking comment on an initial plan to allow up to 480 snowmobiles plus 60 multiple passenger snow coaches per day into Yellowstone during the winter (AP Photos/Craig Moore, file)
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