A bear cub learns a valuable lesson as its mother picks off an elk calf that has found itself alone and defenseless.

Ecologist Chris Morgan explores the plant life that blankets the Arctic Tundra, including lichen—a staple for the region's caribou populations.

In order to film when the Arctic wildlife is most active, ecologist Chris Morgan and filmmaker Joe Pontecorvo sacrifice long stretches of sleep for a series of short catnaps.

When a bison goes down, grizzlies vie for control of the carcass. Ravens and wolves call for reinforcements.

Ecologist Chris Morgan and filmmaker Joe Pontecorvo prep for the Arctic, where they will venture in search of polar bears.

Ecologist and bear biologist Chris Morgan and filmmaker Joe Pontecorvo struggle to keep warm as they shoot in the frozen Arctic.

Ecologist Chris Morgan sports an ice mustache during filming in the middle of the frozen Arctic landscape.

Filmmaker Joe Pontecorvo points out unexpected similarities between the frozen Arctic and dry desert landscapes.

With 150 miles to go before he reaches the North Slope, Chris Morgan continues to travel up the Alaskan coast--leaving behind the greener parts of the state for the arctic cold.

As Chris reaches Atigun Pass, a high mountain pass across the Brooks Range, he enters a prehistoric-looking landscape—devoid of trees and seemingly devoid of all life.