Seeking Safe Passage - Scientists are increasingly discovering the benefits of protecting wildlife corridors, like those in the Yellowstone ecosystem, that connect isolated wildlife habitats.

A Top Dog Takes Over - Exterminated from Yellowstone National Park eight decades ago, gray wolves are back — and boosting the park's biodiversity.

Rebirth of Yellowstone's Wolves - The saga of the first wolf pups born in the region in seven decades

Clash of the Carnivores - What happens when the hunters become the hunted at Yellowstone?