If a bison is displeased with you, it's not hard to tell. One tourist family learned this as they got too close to a bison calf and the elders let them know to back off.
Researchers are putting the embryos of Yellowstone Bison into female bison in Minnesota and other areas hoping for genetic diversity and to re-spread America's official animal.
I bet the paramedics at Yellowstone have the craziest stories. This woman could have easily been one of those stories. Lucky for her, this photo op was just a close encounter.