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

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

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 ...

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

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