What happens to nature after a nuclear accident? And how does wildlife deal with the world it inherits after human inhabitants have fled?

The two-part special "Dogs That Changed the World" tells the epic story of the wolf's evolution, how "man's best friend" changed human society and how we in turn have radically transformed dogs.

Discover the epic history of the Druids, one of more than a dozen gray wolf packs now occupying the 2.2 million acres of Yellowstone National Park.

In the vast and complex kingdom of Yellowstone, two dominant predators reign supreme: the grizzly bear and the wolf.

On a remote Arctic island, a breeding pair of gyrfalcons and a pack of Arctic wolves struggle to raise their young as nine months of snow and ice melt away.

NATURE presents a breathtaking look at wintertime deep within Yellowstone, America's first national park.

(Airs Sunday, October 10) In 1893, a bounty hunter named Ernest Thompson Seton journeyed to the untamed canyons of New Mexico on a mission to kill a dangerous outlaw: a wolf named Lobo.

NATURE investigates the sometimes exasperating efforts of people and wild animals to adapt to each other when their worlds collide.