Bison 'thunder' through crowd of panicked Yellowstone tourists
Yellowstone is home to nearly 5,000 bison, which must contend with wolves in the winter, and wolves and grizzly bears during ...
Yellowstone cougars 'saunter' across ridge in rare sighting
A guide in Yellowstone National Park last week captured footage of rarely seen cougars traversing a snow-covered ridge as if ...