A guide in Yellowstone National Park recently witnessed a chase between wolves and bison and caught the action on video. Watch here.

A bison entered a hot spring at Yellowstone National Park and died in front of horrified tourists. See witnesses’ accounts here.

Tourists at Yellowstone National Park were watching some bears from an overpass when, suddenly, they got an unexpected bison encounter.

Yellowstone announced the first bison attack of the year. A man approached a bison in the park, and the animal “gored” him. Learn more.

A group of tourists on a winter safari in Yellowstone National Park got an unexpected and very up-close encounter with a wolf pack.

Wildlife photographers experienced a “special moment in Yellowstone” when they spotted a pair of cougars walking along a snowy ridge line.

A famous and beloved Yellowstone-area bison, Speedy, died last week at a wildlife sanctuary. Learn more about Speedy and her legacy here.

Wolf 907F, Yellowstone’s oldest wolf at over 11 years old, died on Christmas Day, according to wildlife biologists. She was a legend.

Michael Hodges braved a winter blizzard in Yellowstone to document just how hardy bison are when Mother Nature does her worst.

“Who pooped in the park?” asks Yellowstone National Park. Can you guess which four animals left these four poo piles?