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

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

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

Millions of people head to Yellowstone National Park each year, making traffic through popular areas a major problem for the ...

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

Wolf 1478F could have become the Junction Butte pack alpha, experts say.

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

A man was gored by a bison in Yellowstone National Park on June 10 after getting too close to the animal, the National Park Service said. The man, a 30-year-old from New Jersey, sustained minor ...

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