In this photo from May a mother black bear with cubs runs toward a group of camera-clicking tourists as the animals cross a bridge in Yellowstone National Park. Montana Fish Wildlife and Parks spokesman Bob Gibson witnessed the encounter and said some visitors ignored or were slow to heed a park official's commands to leave the bridge.
In this photo from May a mother black bear with cubs runs toward a group of camera-clicking tourists as the animals cross a bridge in Yellowstone National Park. Montana Fish Wildlife and Parks spokesman Bob Gibson witnessed the encounter and said some visitors ignored or were slow to heed a park official's commands to leave the bridge. Bob Gibson/Montana Fish, Wildlife and Parks Associated Press
In this photo from May a mother black bear with cubs runs toward a group of camera-clicking tourists as the animals cross a bridge in Yellowstone National Park. Montana Fish Wildlife and Parks spokesman Bob Gibson witnessed the encounter and said some visitors ignored or were slow to heed a park official's commands to leave the bridge. Bob Gibson/Montana Fish, Wildlife and Parks Associated Press

National

June 20, 2016 5:08 PM

Yellowstone officials now studying humans, the most problematic species of all

  Comments  

Videos

Nation & World Videos