Wyoming bus crash: Three tourists on a bus were injured when their tour bus tipped over in Grand Teton National Park, in Wyoming. In nearby Yellowstone park, Firehole Lake Drive was closed when a road melted due to underground thermal activity.
Yellowstone volcano: A viral video of running bison prompted calls and emails to Yellowstone officials, who say the bison aren't fleeing the Yellowstone supervolcano, they're just responding to 'spring-like' weather.
Yellowstone bison are among the last pure-bred bands of wild bison in the US. A USDA study concludes the 4,000 bison in Yellowstone national park deemed free of cattle disease could be used to start new bison herds elsewhere.
Government scientists have recommended that grizzly bears in the Yellowstone area no longer need listing under the Endangered Species Act. But environmentalists warn of a potentially declining bear population tied to climate change.
Yellowstone grizzly attacks: Two attacks by grizzly bears, in Yellowstone National Park and 70 miles away, left four people with minor injuries. Two hikers surprised a sow grizzly and her cub on a trail near Canyon Village in Yellowstone Thursday.
Ted Turner bison agreement allowed state to transfer Yellowstone bison to billionaire's care for five years in exchange for their most of their calves. Judge upholds agreement, letting Ted Turner keep 150 bison calves.