Things to Do Natural Wonders 7 Natural Wonders On the Way to Yellowstone Boar’s Tusk in the Killpecker Sand Dunes Boar's Tusk in the Killpecker Sand Dunes Share this Facebook Icon Twitter Icon Email Icon Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In