Ecologist Chris Morgan travels to far eastern Russia, in search of the big cats that hold rank in the frozen forests.

Ecologist Chris Morgan shares photos from his time in Russia during the filming of Siberian Tiger Quest.

In this scene from Siberian Tiger Quest, filmmaker Sooyong Park discusses the emotional challenges that come with filming the natural world in extreme isolation for long periods of time.

View footage of the first wild Siberian tiger that filmmaker Sooyong Park captured on camera in this scene from Siberian Tiger Quest.

Hunted almost to extinction, the last wild Siberian tigers can only be found in the forests of the far eastern Russian frontier—but not easily. Siberian Tiger Quest premiered Wednesday, October 10 at 8/7c (check local listings).

Ecologist Chris Morgan observes a family of black bears that live in Anchorage, Alaska's urban mecca. Watch video from Bears of the Last Frontier: The Road North.

A black bear is relocated from the streets of Anchorage to the greener, more bear-friendly surroundings of Chugach State Park. Watch video from Bears of the Last Frontier: The Road North.

Ecologist Chris Morgan sets up camp alongside the largest concentration of grizzlies in the world.

A brown bear mother and her cubs come within feet of ecologist and bear biologist Chris Morgan. Watch video from Bears of the Last Frontier: City of Bears.

The scent that a female brown bear gives off helps the male determine if she is receptive to mating. Watch video from Bears of the Last Frontier: City of Bears.