Yellowstone Wolves

This March, 2007 photo provided by National Park Service photographer Doug Smith shows a Gibbon wolf pack standing on snow in Yellowstone National Park, Wyo. Restrictions on gray wolf harvests around Yellowstone are under consideration as the state prepares to kick off its inaugural wolf trapping season on Dec. 15, 2012. Conservation groups want limits on trapping after several wolves collared by park scientists for research were shot by Montana hunters in recent weeks. (AP Photo/National Park Service, Doug Smith)