Looks like a High Brown Fritillary
This bull elk (I believe he's know as "Touchdown") and a harem of cows were hanging around the west side of the Mammoth Hotel. He was later seen, by others in our group, to go across the street and pick a fight with another bull.
09/24/2014, 4:35 PM
Canon EOS 5D Mark II, 1/125 sec, f/8, 88mm (EF24-105mm f/4L IS USM), ISO 400, Exp comp 0
Saw on road exiting Northern Yellowstone.
Many seen, most notably in Mammoth Falls Area of Yellowstone
Yellowstone National Park