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: ...

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 ...

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 ...

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 ...