Allan Hathaway, a wildlife photographer, captured the video of the Wapiti wolf pack chasing after the lone bison in Yellowstone National Park.

A tourist guide at Yellowstone filmed a wolf chasing after an elk for about 3.5 to 4 miles.

It’s an animal-eat-animal world out there, especially in Yellowstone National Park. There are almost 70 different mammal species in Yellowstone, and most of those can be separated into two categories: ...

In Yellowstone National Park, bison aren't just iconic wildlife; they're quiet ecosystem engineers. Once nearly wiped out, these massive grazers are now reshaping entire landscapes in ways scientists ...

HELENA, Mont. -- There are new details in the death of a baby bison at Yellowstone National Park that has sparked so much outrage. Park officials are now explaining why they had to euthanize the bison ...

WAPITI, Wyo. -- A Colorado man required medical treatment at a hospital after he was gored by a bull bison at Yellowstone National Park in Wyoming, officials said. The 34-year-old man was walking with ...

In Yellowstone’s wild chess match between wolves and cougars, it turns out the real power play is theft. After tracking nearly a decade of GPS data and thousands of kill sites, researchers found that ...