On their first migration to their summer range in southeastern Yellowstone, three-week-old calves of the Cody elk herd follow their mothers up a 4,600-foot slope. A few hours earlier they swam the ...

And then a portion of the herd keeps going ... race up and down the highway to and from Yellowstone National Park and neighboring areas, more elk, deer and pronghorn meet their fates on the ...

Wolves culled the elk. Fewer elk means more aspens can grow. More beavers are attracted to the trees. It's called a trophic ...

Not even park rangers are off limits for angry bull elk.

Yellowstone's bison herd carries an uncontrolled pocket of the ... for the disease in more reliable lab tests. Thousands of elk in the region also carry the disease, but are not managed similarly.

Yellowstone is home to some of North America's most iconic wildlife, including the Big Five. Here's what you need to know ...

Three decades after their reintroduction, Yellowstone’s wolves have transformed the park. What’s next for the ecosystem and ...

About 50 Yellowstone National Park visitors got the ... Perched above Hayden Valley, they watched as the Wapiti Lake wolf pack pursued a herd of bison, sprinting through deep snow.