A tour group watched a pack of wolves unsuccessfully try to take down a bison in Yellowstone National Park this past weekend.

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images Over ...

With more than half of the translocated wolves now dead, Colorado's wolf reintroduction program is unraveling.

Biologists say wolf packs have contributed to the decline in Yellowstone elk numbers over the last 30 years since they were reintroduced to the park, but many also say that the elk population before ...

Image via Shutterstock In the battle of bison vs wolf, the bison has emerged the victor. A buffalo sent a wolf flying while at Yellowstone. The incident happened at the Blacktail Plateau. Wolves ...

Thirty years ago, park rangers reintroduced grey wolves into Yellowstone National Park. They wanted to restore the ecosystem and get the elk... How the wolf changed Yellowstone 30 years after ...

A prominent wolf that lived among Yellowstone's most famous wolf pack is believed to have been illegally shot and killed just outside the park last month, according to wildlife experts. The wolf was ...

Trail cameras in Yellowstone National Park are capturing thousands of hours of footage of elusive cougars, leading to a new ...

Over the last three decades, Yellowstone National Park has undergone an ecological cascade. As elk numbers fell, aspen and willow trees thrived. This, in turn, allowed beaver numbers to increase, ...