Memebers of the Shoshone-Bannock tribe from Ft. Hall, Idaho prepare to harvest bison that have just crossed the border of Yellowstone National Park into the Gallatin National Forest in the Gardiner Basin, Montana. The bison can be shot and harvested by four different native American tribes as part of their treaty rights to hunt bison that leave Yellowstone National Park. Under new bsion managments rules the Yellowstone bison will be allowed to wander into the Gardiner Basin during the winter but must be back in Yellowstone National Park by May 1st.