A gigantic bulge in the north rim of the Yellowstone caldera is the latest sign of volcanic activity in the national park.

A gray wolf was illegally shot and killed just north of Yellowstone National Park last month. According to wolf advocates, ...

Footage captures grizzly bear venturing out in Yellowstone, way before its typical hibernation period ends ...

Rangers at Yellowstone National Park are reportedly trying to solve the mystery of what happened to a well-known female wolf ...

“People like this are helping out with preventing overpopulation. Give your thanks." Tourist risks safety by sneaking up on bison at Yellowstone National Park: 'That man would have been seriously hurt ...

Scientists are monitoring a city of Chicago-sized swath of rising ground at the northern volcanic rim of the Yellowstone ...

The story of wolves in Yellowstone National Park is one of the most successful—and scrutinized—wildlife restoration projects ...

Learn more about the past eruptions at Yellowstone National Park and how each new eruption displaced evidence of the past.

Lassen Volcanic National Park, about a four-hour drive north of San Francisco, feels like a secret getaway.

A grizzly spotted out wandering in Yellowstone National Park on Monday might be up from hibernation incredibly early or awake ...